In a class of 30 students, 13 have a brother and 8 have a sister. There are 3 students who have a brother and a sister. What is the probability that a student who has a sister also has a brother?
Answers
If In a class of 30 students, 13 have a brother and 8 have a sister. There are 3 students who have a brother and a sister. The probability that a student who has a sister also has a brother is: 3/10.
Determining the probabilityGiven data:
Total number of student = 30
Brother = 13
Sister = 8
Brother and sister = 3
Now let determine the probability that a student has brother and sister using this formula
P ( S n B ) = Brother and sister / Total number of student
Let plug in the formula
P ( S n B ) = 3/30
Therefore we can conclude that 3/30 is the probability.
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Answer:
3/8
Step-by-step explanation:
Related Questions
What is the x ponet of y
;-;
Answers
The variable y is shown with no exponent. Any term with no exponent is understood to have an exponent of 1, so y has an exponent of 1.
X=
/////////////////////
Answers
Answer:
x = 60
Step-by-step explanation:
(2x + 15)° and 135° are corresponding angles and are congruent , then
2x + 15 = 135 ( subtract 15 from both sides )
2x = 120 ( divide both sides by 2 )
x = 60
Answer:
x = 60
Step-by-step explanation:
The two angles are corresponding. This means that both of the angles are congruent (same). So, you set both of them equal to each other. That means to do 2x + 15 = 135. You do basic algebra and then you get 60 for x. Hope this helps!
Complete each statement with a number that makes the statement true.
A. __< 7°C.
B. __ <-3°C.
C. -0.8°C <___< -0.1°C
D. __> -2°C
Answers
Answer:
A. 6°C
B. -4°C
C. -0.7°C
D. -1°C
Answer:
A. 6°C < 7°C.
B. -4°C < -3°C.
C. -0.8°C < -0.7°C < -0.1°C
D. -1°C > -2°C
Eric is buying food for an upcoming holiday party. He can get pizzas for $7 each using a coupon he found online, and he wants to figure out the cost of buying 12 pizzas so he can plan his budget. Please provide answers to each of the following questions:
What is the direct variation equation that represents this situation? (worth 2
points)
How much will Eric spend if he buys 12 pizzas? (worth 2 points)
Explain how you calculated his total cost for pizzas. (worth 2 points)
Answers
Answer:
The answer would be 7 times 12
Eric will spend $84
I calculated it by seeing how much each of the pizzas cost-$7 the I figure out how many pizzas he need-12 Now what we need to do is multiply 7 and 12 because if one pizza is $7 (Stated in the written problem) then I know that it would be 7+7+7+7+7+7+7+7+7+7+7+7 12 times, one time for each pizza needed. The simpler version would be 7 time 12 which then we would get a value of $84.
Step-by-step explanation:
Hope this helps!!
Answers to all the subparts using equations are:
(A) Equation: 7x = C(B) Cost of 12 pizzas: C = $84(C) Total cost can be calculated easily by substituting the number of pizzas bought which is 12 in this case in the place of x.What exactly are equations?A mathematical expression with an equals sign is referred to as an equation. Algebra is widely used in equations. When performing calculations but unsure of the precise amount, algebra is used.The point-slope form, standard form, and slope-intercept form are the three main types of linear equations.
So, the answers to all the subparts are as follows:
(A) Equation that can be formed is:
Let, the cost be C.x be the number of pizza buying.Equation: 7x = C(B) Cost of 12 pizzas:
Let, x = 12.
Then,7x = C7(12) = CC = $84(C) Total cost can be calculated easily by substituting the number of pizzas bought which is 12 in this case in the place of x.
Therefore, answers to all the subparts using equations are:
(A) Equation: 7x = C(B) Cost of 12 pizzas: C = $84(C) Total cost can be calculated easily by substituting the number of pizzas bought which is 12 in this case in the place of x.Know more about equations here:
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Correct question:
Eric is buying food for an upcoming holiday party. He can get pizzas for $7 each using a coupon he found online, and he wants to figure out the cost of buying 12 pizzas so he can plan his budget. Please provide answers to each of the following questions:
(A) What is the direct variation equation that represents this situation? (worth 2
points)
(B) How much will Eric spend if he buys 12 pizzas? (worth 2 points)
(C) Explain how you calculated his total cost for pizzas. (worth 2 points)
10 to the 3d power + 10 to the 2nd power + 10 to the 1st power
Answers
Answer: 1110
Step-by-step explanation:
Answer:
1,110
Step-by-step explanation:
1. Multiply to the powers(?)
10 x 10 x 10 = 1000
10 x 10 = 100
10 = 10
2. Add
1000 + 100 + 10 = 1110
M= 19.7t² + 310.5t +7539.6
F= 28t² + 368t + 10127.8
modeling with mathematics during a recent period of time, the number (in thousands) of males M and females F that attend degree-granting institutions in the United States can be modeled by M= and F=
where t is time in years. Write a polynomial in standard form to model the total number of people attending degree-granting institutions. The polynomial is P=
Answers
Using addition of polynomials, the function modeling the number of people attending degree-granting institutions is:
P(t) = 48.7t² + 678.5t + 17667.4.
What is the function for the total number of people attending the institutions?The number of males is given by:
M(t) = 19.7t² + 310.5t + 7539.6.
The number of females is given by:
F(t) = 28t² + 368t + 10127.8.
The total number is given by the addition of the number of males and of females, that is:
P(t) = M(t) + F(t).
Which is an addition of polynomials. To add the polynomials, we combine the like terms, that is, adding the terms that have the same variable and exponent. Hence:
P(t) = M(t) + F(t).
P(t) = 19.7t² + 310.5t + 7539.6 + 28t² + 368t + 10127.8.
P(t) = 48.7t² + 678.5t + 17667.4.
Which is the desired function.
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The animals at a safari park include crocodiles, deer and penguins.
There are 16 more deer than there are crocodiles. 4 There are 3 times as many penguins as there are crocodiles. There are the same number of deer as there are penguins.
How many crocodiles are there at the safari park?
Answers
Answer:
8
Step-by-step explanation:
8x3 = 24
8+ 16 = 24
1. (01.01 LC)
Which of the following is a flat surface that extends infinitely, has length and width, but does not have depth?
Angle
O Circle
O Plane
Segment
Answers
Answer:
plane
Step-by-step explanation:
The plane is flat like a wall or the floor. It has infinite length and infinite width but has no thickness (as thick as a line--which has no thickness) basically a line is one-dimensional and a plane is two-dimensional.
See image.
Can someone please help me
Answers
In accordance with analytic geometry, the equation that represents the line is y = - (1 / 4) · x - 6.
What is the equation for a line shown on a graph?
Herein we find the representation of a line set on a Cartesian plane. According to analytic geometry, line are represented by equations of the form y = m · x + b, where m, b are the slope and the y-intercept, respectively.
Both the values of the slope and the y-intercept can be found by knowing the location of two points lying on the line. If we know that (x₁, y₁) = (0, - 6) and (x₂, y₂) = (4, - 7), then we find the following system of linear equations:
b = - 6 (1)
4 · m + b = - 7 (2)
By (1) in (2):
4 · m - 6 = - 7
4 · m = - 1
m = - 1 / 4
The equation that represents the line is y = - (1 / 4) · x - 6.
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suppose 9 people arrive at a bank at the same time. in how many ways can they line up to wait for the next available teller? a) 40,320 b) 362,880 c) 9 d) 5,040 e) 81 f) none of the above.
Answers
The number of ways in which they can line up to wait for the next available teller is 362880.
What is termed as the permutation?We occasionally want to understand how many different ways we can order a set of items. A permutation is the number of different ways this may be done.We want to know how many different ways there are to line up 9 people.
We can choose one of the nine people in line to take the first spot. There are just eight people left to select from once we've decided who will fill this position. This means that only eight people can fill this same second position in this line. Now that the first two spots are filled, there are just seven people left to fill the third, and this line of thought can continue until the last spot is filled.= 9×8×7×6×5×4×3×2×1
= 362880
Thus, the number of ways in which they can line up to wait for the next available teller is 362880.
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resuelve la siguiente ecuación con el metodode suma y resta x + y = 5
2x + y = 4
Answers
La solucion del sistema de ecuaciones es x = 1, y = 4, o (1, 4) en notación standard.
¿Como resolver el sistema de ecuaciones?Aqui tenemos el sistema de ecuaciones:
x + y = 5
2x + y = 4
Si tomamos la segunda ecuación, y a esta le restamos la primera, obtendremos:
(2x + y) - (x + y) = 5 - 4
(2x - x) + (y - y) = 1
x = 1
De esta forma encontramos el valor de x, para encontrar el valor de y, deberemos reemplazar x = 1 en una de las ecuaciones. Yo usare la primear.
x + y = 5
1 + y = 5
y = 5 - 1
y = 4
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What is the y-intercept of f(x) = -2 (1/2)^x?
Answers
Answer:
-2
Step-by-step explanation:
f(x) = -2 (1/2)^x
you find the y-intercept where x = 0
= -2 (1/2)^0
= -2 *1
= -2
Helpppp please , fast
Answers
The coordinates of the orthocenter of triangle DEF are given as follows:
(6.67, -2).
How to find the orthocenter of a triangle?The orthocenter of a triangle is the point of intersection of the three altitude lines of the triangle.
Hence, we need to find two of the lines, and them find the intersection point between them, as the third line will necessarily intersect these lines at this point.
The midpoint of segment DE is:
(6, 1).
Which is the mean of the coordinates.
Vertex F is at point (8, -8), hence the slope of the line with these two points is:
m = (-8 - 1)/(8 - 2) = -9/2 = -4.5.
Hence:
y = -4.5x + b.
When x = 6, y = 1, hence we can find b as follows:
1 = -4.5(6) + b
b = 28.
Hence one line is:
y = -4.5x + 28.
The midpoint of segment EF is:
(8, -1.5).
Which is the mean of the coordinates.
Vertex D is at point (4, -3), hence the slope of the line with these two points is:
m = (-1.5 - (-3))/(8 - 4) = 0.375.
Hence:
y = 0.375x + b.
When x = 8, y = -1.5, hence we can find b as follows:
-1.5 = 0.375(8) + b
b = -4.5.
Hence the two lines that we have to find the intersection point is:
y = -4.5x + 28.y = 0.375x - 4.5.Then the x-coordinate of the orthocenter of the triangle is:
-4.5x + 28 = 0.375x - 4.5
4.875x = 32.5
x = 32.5/4.875
x = 6.67.
The y-coordinate of the orthocenter of the triangle is:
y = 0.375(6.67) - 4.5 = -2.
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find x
please and thank you
Answers
Answer: x = 65
Step-by-step explanation:
1) First find the mini triangles, left and right angles
We will be calling the left one A and the right one B.
2) Next use triangle sum to find B.
62 + 50 + b = 180
b = 68
3) Use triangle sum again to find A.
53 + 80 + a = 180
a = 47
4) Use triangle sum to find the top mini angle.
47 + 68 + c = 180
c = 65
5) Since x is in the vertical angle of c, they are equal
c = x
65 = x
Homework: Section 3.4HomeworkQuestion 6, 3.4.25 >HW Score: 50%, 5 of 10 pointsO Points: 0 of 1SaveFind an nth-degree polynomial function with real coefficients satisfying the given conditions. If you are using a graphing utility, use it to graph the function and verifythe real zeros and the given function value.n=3;3 and 4 i are zeros;f(2)=40f(x)=(Type an expression using x as the variable. Simplify your answer.)Clear allCheck answerHelp me solve thisView an example Get more help.
Answers
The roots are
[tex]\begin{gathered} x=3 \\ x=4i \\ x=-4i \end{gathered}[/tex]The polynomial can be modellled as ;
[tex]f(x)=a(x-3)(x-4i)(x+4i)[/tex][tex]f(x)=a(x-3)(x^2+16)[/tex]
Let us use f(2) to obtain a value for a
[tex]\begin{gathered} f(2)=a(2-3)(2^2+16) \\ 40=-20a \\ a=-2 \end{gathered}[/tex]The polynomal f(x) is given as
[tex]\begin{gathered} f(x)=-2(x-3)(x^2+16) \\ f(x)=-2x^3+6x^2-32x+96 \end{gathered}[/tex]A car’s velocity increases from 4.2m/s to 14.8 m/s, E, in 2.5 sec. What is its acceleration?
Answers
The acceleration is 4.24 m^2/s
What is acceleration?
They are accelerations and vector quantities. The direction of an object's acceleration is determined by the direction of the net force acting on it. Acceleration describes the rate at which a speed changes over time.
The velocity is changing over time. The velocity is actually changing at a constant rate of 10 m/s per second. If an object's velocity is changing, it is said to be accelerating; it has acceleration.
According to question,
Acceleration = final velocity- initial velocity/ time
Final velocity = 14.8 and initial velocity = 4.2
Hence, acceleration = 14.8-4.2/2.5
=10.6/2.5
=4.24.
The acceleration is 4.24 m^2/s.
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Question 4 of 5
Compare -2 and 5. Which statement is not true?
OA. 5 is farther to the right on a number line.
OB. 151>1-21
C. -2 has a greater absolute value.
O D. 5 is farther from zero on a number line.
Answers
Determine if 0.868668666866668666668...0.868668666866668666668... is rational or irrational and give a reason for your answer.
Answers
The numbers given as 0.868668666866668666668... and 0.868668666866668666668... are irrational numbers
How to categorize the numbers?From the question, the numbers are given as
0.868668666866668666668... and 0.868668666866668666668...
As a general rule.
Numbers that end in three dots are irrational numbers
The above is true because
These numbers are non-terminating decimals (i.e. theu do not end)These numbers cannot be represented as a fraction of integersWhen numbers cannot be represented as a fraction of integers, then such numbers are irrational numbers
Hence, the numbers are irrational numbers
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Both the given values 0.868668666866668666668.. and 0.868668666866668666668... are irrational numbers.
What are irrational numbers?An irrational number is a type of real number which cannot be represented as a simple fraction or the values that have face value are irrational numbers. Example: √2, √3, and π are all irrational.
Here,
Both numbers are irrational numbers, because
Thus, Both the given values 0.868668666866668666668.. and 0.868668666866668666668... are irrational numbers.
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after the given information, at least how many more steps are necessary to solve this proof
Answers
The following steps would be:
• TP and TP (for both triangles) are congruent by the reflexive property.
,• The triangles are congruent by the SAS theorem.
,• Angle S and angle O are congruent.
ABCD is a quadrilateral.
Work out angle x.
В.
B
8 cm
A
X
6 cm
D
FIND x (
ABCD IS A QUADRILATERAL)
29%
13 cm
C
Answers
(Use law of sines)
A/Sin a = B/Sin b
10/Sin 29 = 13/Sin x
Sin(x)=(13sin(29))/10
Sin(x)= 0.63
(x=39)
Imagine you went to the store and bought a video game for $12.98. This item is taxable at 6% tax and the total tax is $0.78. What is the total amount due?
Next, you decide to pay with a $20.00 bill. How much change will you receive after paying for your video game?
Answers
Using simple linear equations we calculate that the change left will be $6.24 .
The equals sign is used to indicate that two expressions on each side of the equal sign are equal in the many mathematical formulas that are utilized to form an equation.
Depending on the language, the definition of the word equation and its cognates may change slightly.The first step in solving a variable equation is to determine the precise values of the unknown variables that lead to the provided equality. The equation's solutions, often referred to as the variables for which the equation must be solved, are the values of the unknowable variables that satisfy the equality.Let the change received be x.
Therefore let us construct an equation for the situation
cost of game + tax + change = 20
or, 12.98 + 0.78 + x = 20
or, 13.76 + x = 20
or, x = 6.24
Therefore he will receive 6.24 after solving the equation.
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Calculate the average rate of change of fover the interval -3≤x≤9. Show the calculations that lead to your answer.
Answers
The function has an average rate of change f is 1/2 over the interval
How to determine the average rate of change f?The possible graph that completes the question is added as an attachment
The interval is given as
-3 ≤ x ≤ 9
This can be rewritten as
x = -3 to x = 9
This can also be represented as
(a, b) = [-3, 9]
From the attached graph, we have
f(-3) = -1.5
Also, we have
f(9) = 0.5
The estimate (to one decimal place) of the average rate of change f is calculated as
Rate = [f(b) - f(a)]/[b - a]
This gives
Rate = [f(9) - f(-3)]/[9 + 3]
So, we have
Rate = [0.5 + 1.5]/[9 + 3]
Evaluate
Rate = 2/12
Simplify
Rate = 1/6
Hence, the average rate of change f is 1/6
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55
1. Given the sequence: 10, 5,
10,5, 2'4"
(a) Write the explicit formula for the sequence.
(b) Generate the next 3 terms. Label appropriately.
81 PI 01
Answers
Malik had a checking account balance of $92.18. His bank will fund the first debit card purchase that creates a negative balance up to a limit of $100.00, but charges a
$28.00 fee for that overdraft. Malik made a purchase of $36.12 yesterday, and another purchase of $76.50 today. He used a debit card for each purchase. What is Malik's
account balance after the two purchases and any overdraft fees?
negative $140.62
negative $20.44
O negative $112.62
O negative $48.44
Answers
hope this helps!
20$ startup fee and a $5 monthly fee write an equation in slope intercept form that models
Answers
The slope intercept form of equation that models $20 startup fee and $5 monthly fee is y = 5x +20 , y is total fee and x is number of months
What is slope intercept form?The slope intercept form of an equation is y = mx + c
where y is y coordinate, x is x coordinate, m is the slope of the line and c is y intercept.
Let the total fee after x months be y
Then y is sum of startup fee and sum of all month's fee
For x months total monthly fees = 5(x)
Therefore the total fee after x months , y = 5x +20 which is same as slope intercept form y=mx+c
when x= 0 ⇒ y = 20 , startup fee
Thus, the equation in slope intercept form is y = 5x +20 ,where y is total fee and x is number of months.
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Which graph represents the solution set for p − 3.6 < −5.8?
Answers
The solution for the given inequality is p < -2.2. The graph that represents the solution is attached below.
Graph of linear inequalitiesFrom the question, we are to determine the graph for the solution set for the given inequality
The given inequality is p - 3.6 < -5.8
First, we will solve the inequality
Solving the inequality
p - 3.6 < -5.8
Add 3.6 to both sides
p - 3.6 + 3.6 < -5.8 + 3.6
p < -2.2
The solution is p < -2.2
The graph of the inequality is shown below
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Answer: number line with an open circle on point negative 2.2 and arrow shaded to the left
Step-by-step explanation:
If this guy is correct
MARKING BRAINLEIST PLS HELP ME OUT HERE
Answers
316 is value of circle's arc BC .
What is an arc in maths?
A circle's arc is referred to as a portion or section of its circumference. A chord of a circle is a straight line that might be created by joining the arc's two ends. A semicircular arc is one whose length perfectly divides the circumference of the circle.A circle's circumference forms an arc. An arc length is the length of the arc, whereas an arc measure is the measurement of the angle the arc makes at the center of a circle. This measurement can be expressed in radians or degrees. Using the fact that pi radians = 180 degrees, we can quickly convert between the two.Short arc BC is the difference between 360° and long arc BAC
arc BC = 360 - arc BAC
= 360 - 44
= 316
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Mohal has a loyalty card good for a discount at his local pharmacy. To find the total he has to pay, before tax, he multiplies the prices by 0.96. What percent discount does the card give?
Answers
The percent discount the card gives can be:
4% or 96%.
What is a percentage?The percentage is calculated by dividing the required value by the total value and multiplying by 100.
Example:
Required percentage value = a
total value = b
Percentage = a/b x 100
We have,
Royal card for discount.
Multiplying the total price to pay with 0.96 means two cases.
0.96 = 96/100 = 96%
Cases 1:
If the percent discount is 96% we will multiply the total prices to pay by 0.96 and subtract the value from the total price.
Example:
Total price to pay = 100
0.96 x 100 = 96
Total price to pay = 100 - 96 = 4
Cases 2:
If the percent discount is 4% we will multiply the total prices to pay by 0.96 after subtracting 4% from 100%.
Example:
Total price to pay = 100
Discount = 4%
100% - 4% = 96%
96% = 0.96
Total price to pay = 0.96 x 100 = 96
Thus,
The percent discount the card gives can be:
4% or 96%.
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Benjamin decides to treat himself to breakfast at his favorite restaurant. He orders chocolate milk that costs \$3.25$3.25dollar sign, 3, point, 25. Then, he wants to buy as many pancakes as he can, but he wants his bill to be at most \$30$30dollar sign, 30 before tax. The restaurant only sells pancakes in stacks of 444 pancakes for \$5.50$5.50dollar sign, 5, point, 50.
Let SSS represent the number of stacks of pancakes that Benjamin buys.
1) Which inequality describes this scenario?
Choose 1 answer:
Choose 1 answer:
(Choice A, Checked)
A
3.25+S \leq 303.25+S≤303, point, 25, plus, S, is less than or equal to, 30
(Choice B)
B
3.25+S \geq 303.25+S≥303, point, 25, plus, S, is greater than or equal to, 30
(Choice C)
C
3.25+5.50S \leq 303.25+5.50S≤303, point, 25, plus, 5, point, 50, S, is less than or equal to, 30
(Choice D)
D
3.25+5.50S \geq 303.25+5.50S≥303, point, 25, plus, 5, point, 50, S, is greater than or equal to, 30
2) What is the largest number of pancakes that Benjamin can afford?
Answers
The correct option is D that is bill is equal to or greater than $30
3.25 + 5.5s < =30
The first step in building the inequality is modelling Benjamin's spendings.
He buys a chocolate milk that costs $3.25, plus S stacks of pancakes, each at $5.50. Thus, in total, his spendings are of:
3.25 + 5.25s
He wants the bill to be of at most $30, that is, his spending has to be at most $30, thus:
T < 30
3.25 + 5.5s < =30
Thus the correct inequality is option D which is 3.25 + 5.5s < =30
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A triangular boat's sail has a total area of 7 square inches.
If the height of the sail is 3 inches less than twice the
length of its base, then find the length of the base and
height.
Answers
Answer: b = 3.5, h = 4
Step-by-step explanation: a = 1/2bh, area of a triangle formula
7 = 1/2((b)(2b-3)) state h in terms of b
7 = 1/2(2b^2-3b) simplify
7 = b^2 - 1.5b simplify
b = 3.5 final answer
Then, solve for h.
h = 7 - 3 substitute
h = 4 final answer
hope this helps!
Step-by-step explanation:
area of a triangle
base × height / 2
in our case
base × height / 2 = 7
base × height = 14
height = 2×base - 3
we can use the last identity in the area equation and get
base × (2×base - 3) = 14
2×base² - 3×base - 14 = 0
the solution to a quadratic equation like
ax² + bx + c = 0
is
x = (-b ± sqrt(b² - 4ac))/(2a)
in our case
base = (3 ± sqrt((-3)² - 4×2×-14))/(2×2) =
= (3 ± sqrt(9 + 112))/4 = (3 ± sqrt(121))/4 =
= (3 ± 11)/4
base1 = (3 + 11)/4 = 14/4 = 7/2 = 3.5 in
base2 = (3 - 11)/4 = -8/4 = -2
negative numbers for sizes of physical objects don't make sense, so, base = 3.5 in is our solution.
height = 2×base - 3 = 2×3.5 - 3 = 7 - 3 = 4 in
base length = 3.5 in
height = 4 in