Work out the area of this semicircle.
Take to be 3.142 and write down all of the digits given by your calculator.
18 cm
Answer:
A = 127.251 cm²
Step-by-step explanation:
the area (A) of a circle is calculated as
A = πr² ( where r is the radius )
the area (A) of a semicircle is then
A = [tex]\frac{1}{2}[/tex] πr²
given diameter = 18 then r = 18 ÷ 2 = 9 cm , so
A = 0.5 × 3.142 × 9² = 0.5 × 3.142 × 81 = 127.251 cm²
8x-5x+21 = 36-6y
Write the equation so that y is a function of x.
The equation so that y is a function of x is y = [tex]\frac{-1}{2}[/tex]x + [tex]\frac{5}{2}[/tex].
What is equation?A formula that expresses the connection between two expressions on each side of a sign. Typically, it has a single variable and an equal sign. Like this: 2x - 4 Equals 2. In the above example, the variable x exists. Equation: A declaration that two expressions with variables or integers are equal. In essence, equations are questions, and attempts to systematically identify the solutions to these questions have been the driving forces behind the creation of mathematics. Equations come in two varieties: identities and conditional equations. All possible values of the variables result in an identity. Only certain combinations of the variables' values make a conditional equation true. Two expressions joined by the equals symbol ("=") form an equation.
Given Data
Function
8x-5x+21 = 36-6y
6y = 36 - 21 - 8x +5x
6y = -3x + 15
y = [tex]\frac{-1}{2}[/tex]x + [tex]\frac{5}{2}[/tex]
The equation so that y is a function of x is y = [tex]\frac{-1}{2}[/tex]x + [tex]\frac{5}{2}[/tex]
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At the school 460 of the students walk to school.
1The number of students who take public transit is 20% of the number of students who walk. How many students take public transit?
2The number of students who bike to school is 5% of the number of students who walk. How many students bike to school
3The number of students who bike to school is 5% of the number of students who walk. How many students bike to school?
Answer:
92 public transit
23 bike
Step-by-step explanation:
460 / 5 = 92
460 / 20 = 23
look at attachment please MATHHHHHHHHHHHHHHHHH
Answer: 89%
[tex]\frac{0.89}{1}*\frac{100}{100} = \frac{89}{100}[/tex]
If a and b are the roots of 2x²+3x-1=0,find the values of a³-b³
Answer:
Step-by-step explanation:
Your equation has two complex roots, a=-3/4+sqrt(23)/4*i and b=-3/4-sqrt(23)/4*i. Calculate (x-a³/b³)*(x-b³/a³) and simplify it to get that expression. It will be a bit tedious, but the result is quite nice.
a³/b³=1001/1024+45*sqrt(23)/1024*i
b³/a³=1001/1024-45*sqrt(23)/1024*i
Notice that these are complex conjugates (which isn’t surprising, because a and b were complex conjugates). That’s why the result (x-a³/b³)*(x-b³/a³) will be a polynomial with real coefficients!
If you have complex conjugate roots c+di and c-di, you always get (x-(c+di))*(x-(c-di))=x²-2cx+c²+d², where c and d are real numbers.
It is -2c=-2*1001/1024=-1001/512, and
c²+d²=(1001/1024)²+(45*sqrt(23)/1024)²=1048576/1048576=1.
How many pounds of apples must chris pick before Pam’s orchard is cheaper that david’s
The total pounds of apples that Chris must pick before Pam’s orchard is cheaper that David's is 14.
How many apples should Chris pick?The first step is to determine the total cost of picking apples from both orchards.
Cost of picking apples from David's Orchard : (10 x $2) + [(x - 10) x $1]
$20 + $x - $10
= $10 + $x
Cost of picking apples from Pam's Orchard : $10 + ($10 x $1.5) + [(x - 10) x 0.75]
$10 + $15 + 0.75x - 7.5
= $17.50 + 0.75x
When Pam's Orchard is cheaper, the equation becomes :
$10 + $x > $17.50 + 0.75x
$x - 0.75x > $17.50 - $10
0.25x > $7.50
x > $7.50 / 2.5
x > 3
Total pounds should be greater than 3, so it can be 4.
Total pounds = 10 + 3 = 14
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which is a appropriate estimate for 53,320x599
The answer after its estimation will be 3,00,00,000.
Here, the 53,320 will be estimated to 50,000 and 599 will be estimated to 600.
So, on multiplying, we get;
50,000×600 = 3,00,00,000
To offer an estimated, projected result rather than an exact result, we employ approximations in our calculations. Calculations are easier to handle when they are estimated using round numbers.
The result of rounding 109 to the closest ten is 110. and 100 is the nearest hundred. 2) Round the number downward if it is followed by the digits 0, 1, 2, 3, or 4. 102, for instance, is 100 when rounded to the closest ten.
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How do you write 8.82 x 102 in standard form?
Answer: Multiply 102 by 8.82 = 899.64x
easy 8th grade math
with explanation pls
Answer:
x: (40,0)
y:(0,30)
Step-by-step explanation:
hope this helped
have a good day :)
two trains leave the station at the same time, one heading west and the other east. the westbound train travels miles per hour slower than the eastbound train. if the two trains are miles apart after hours, what is the rate of the westbound train?
if the two trains are miles apart after hours, then the rate of the westbound train is 79 miles per hour
two trains leave the station at the same time, one heading west and the other east.
the westbound train travels miles per hour slower than the eastbound train. if the two trains are miles apart after hours,
what is the rate of the westbound train?
Allow the westbound train to be "w" and the eastbound train to be "e". We can make the following equation:
4 (e + (e - 12)) = 680
4 (2e + 12) = 680
8e - 48 = 680
8e = 728
e = 91 mph
e - 12 = w
91 - 12 = w
79 = w
Therefore, the westbound train travels at 79 miles per hour.
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When 4a-a is simplified it’s equivalent to
Answer: 3a
Step-by-step explanation: 4a - 1a = 3a
PLEASE HELP I AM GROUNDED AND MY MOTHER IS SO MAD AT ME FOR MY GRADE
Answer: b=116, c=64
Step-by-step explanation:
Create a division equation that represents the question: How many \frac{3}{8} are in \frac{5}{4} ?
The division equation that represents number of 3/8 in 5/4 is 10/3 = x.
Given,
Fractions : 3/8 and 5/4
We have to find a division equation for number of 3/8 in 5/4
Number of 3/8 in 5/4 = x
Now,
Number of a in b = b/a
So here,
Number of 3/8 in 5/4, x = 5/4 / 3/8
Number of 3/8 in 5/4, x = 5/ 3/2
Number of 3/8 in 5/4, x = 5 × 2 / 3
Number of 3/8 in 5/4, x = 10/3
That is,
The division equation that represents number of 3/8 in 5/4 is 10/3 = x.
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There are 20 balloons in Emma's hand. Four-fifths are red
balloons. How many red balloons are in Emma's hand?
Answer:
16
Step-by-step explanation:
4/5=0.8
20*0.8=16
(1 × 10¹)(8 × 10^4) help
Answer:
800000
Step-by-step explanation:
(1 x 10^1) = 10
(8 x 10^4) = 80000
10 x 80000 = 800000
The mass of a textbook is approximately 0.0165 metric tons. If this number were written in scientific notation, what would the
exponent be?
If the number were written in scientific notation, the exponent will be -2.
What is scientific notation?Scientific notation is a method of expressing numbers that are either too large or too little to be represented in decimal form. In the United Kingdom, it is known as scientific form, standard index form, or standard form.
The number of times a number is multiplied by itself is referred to as its exponent.
In this case, the mass of a textbook is approximately 0.0165 metric tons. It should be noted that this will be 1.65 × 10^-2. The exponent is -2.
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Aurora is planning to participate in an event at her school's field day that requires her to complete tasks at various stations in the fastest time possible. To prepare for the event, she is practicing and keeping track of her time to complete each station.
The x-coordinate is the station number, and the y-coordinate is the time in minutes since the start of the race that she completed the task.
(1, 3), (2, 6), (3, 12), (4, 24)
Part A: Is this data modeling an arithmetic sequence or a geometric sequence? Explain your answer. (2 points)
Part B: Use a recursive formula to determine the time she will complete station 5. Show your work. (4 points)
Part C: Use an explicit formula to find the time she will complete the 9th station. Show your work. (4 points)
From the given sequence, it is found that:
a) It is a geometric sequence, as the ratio between consecutive terms is the same.
b) Station 5 will be completed in 48 minutes.
c) Station 9 will be completed in 768 minutes.
What is a geometric sequence?In a geometric sequence, the result of the division of consecutive terms is always the same, called common ratio q.
The nth term of a geometric sequence is given by the following rule:
[tex]a_n = a_1q^{n-1}[/tex]
In which [tex]a_1[/tex] is the first term.
In the context of this problem, the ratio between consecutive terms is given by:
r = 24/12 = 12/6 = 6/3 = 2.
Hence it is a geometric sequence.
Applying the recursive formula, the time for Station 5 is the time for Station 4 multiplied by the common ratio of 2, hence:
24 x 2 = 48 minutes.
The first term of the sequence is of 3, hence the explicit formula is given by:
[tex]a_n = 3(2)^{n-1}[/tex]
Hence the time for the 9th station, in minutes, is given as follows:
[tex]a_9 = 3(2)^{8} = 768[/tex]
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NEED HELP ASAP WILL MARK BRAINLIEST
Answer:
b -3
Step-by-step explanation:
t-3(4-t)=-24 multiply
t-12+3t=-24 simplify
4t-12=-24 plus 12 on both side
4t=-12 divide 4 on both side
t=-3
PLEASE HELP ME!!! due tonight *will make brainlist , if answer is correct*
Jason bought four tickets to a basket ball game. He paid a total of $42.10 for the tickets and his parking was $6.50. What is the cost of each ticket
The cost of each ticket is 8.9 dollars.
What is cost price?
In mathematics, the term cost price can be explained with the help of profit which states, as the amount which is on the commodity and in the form of standard price called cost price. For the profit, the amount of the commodity can be designed by the shopkeeper which is bigger amount as per the cost price.
According to the question, the Jason bought 4 tickets for basket ball game. He paid a total cost of $42.10 for the tickets and for parking as $6.50
The paid amount for the 4 tickets is: $42.10.
And the parking cost is: $6.50
Total cost price without parking is: $42.10 - $6.50 = $35.60
Therefore, to calculate the cost of each ticket is: 35.60/4 = 8.9 dollars
Hence, the cost of each ticket is 8.9 dollars.
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Please help!!
I’ll give you the Brainiest
You are shopping for T-shirts. Store A has T-shirts
priced at $25 for 2 shirts. Store B has T-shirts
priced at $42 for 4 shirts. Which store offers the
better deal?
Answer: The answer is the $42 T-Shirts
Step-by-step explanation: 42 divided by 4 is 10.5 dollars per t-shirt.
25 divided by 2 would mean 12.5 dollars per t shirt. There is only a 2 dollar difference, but it is clear that the 4 t-shirt deal is the best.
Zach and Ginny are building model cars. Ginny's car is 2 more than 3 times the length of Zach's car. The sum of the lengths of both cars is 30 inches. Write an equation to determine the lengths of Zach's and Ginny's cars. A. 3x+2=30B. x+2+3x=30C. 2x+3=30D. x+2x+3=30
We can represent the length in Zach's car model by x
Since we have been given that Ginny's car is 2 more than 3 times the length of Zach's car, then we can get the expression as follow
[tex]\begin{gathered} 3\text{ times the length of Zach's car is} \\ 3\times x=3x \\ \end{gathered}[/tex][tex]\begin{gathered} 2\text{ more than 3 times the length of Zach's car will be} \\ 2+3x \end{gathered}[/tex]Therefore,
Ginny's model will be 2 + 3x
Next, we are told that the sum of the lengths of both cars is 30 inches
Then
[tex]\begin{gathered} Zach\text{+}Ginny=30 \\ x+2+3x=30 \end{gathered}[/tex]Therefore,
The answer is
[tex]x+2+3x=30[/tex]Thus, the answer is Option B
The diagram below shows the first four of a series of designs that an artist draws on artwork.
The artist wants to use a design with a maximum of 15 shaded circles. What number of design should the artist use?
Using an arithmetic sequence, the number of design that the artist should use is:
b. Design 6.
What is an arithmetic sequence?In an arithmetic sequence, the difference between consecutive terms is constant and is called common difference d.
The nth term of an arithmetic sequence is given by the rule presented as follows:
[tex]a_n = a_1 + (n - 1)d[/tex]
In which [tex]a_1[/tex] is the first term of the sequence.
The sequence for the number of circles is:
(4, 6, 8, ...)
Hence the common difference is given by:
d = 8 - 6 = 6 - 4 = 2.
Then the rule for the nth term is:
[tex]a_n = 4 + 2(n - 1)[/tex]
As the first term is of 4.
The maximum number is of 15 shaded circles, hence:
4 + 2(n - 1) ≤ 15
4 + 2n - 2 ≤ 15
2 + 2n ≤ 15
2n ≤ 13
x ≤ 6.5.
Hence the maximum number is of 6, meaning that Design 6 is chosen, given by option b.
Missing informationThe complete problem is given by the image at the end of the answer.
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please help like soon
The distance between the two points is 10 units and the slope of the line is -78/25
Distance Between Two Points
To find the distance between two points, we can simply use the formula of distance between two which is given as
[tex]d=\sqrt{(y_2-y_1)^2 + (x_2 - x_1)^2}[/tex]
Let's substitute the values and solve for the distance.
[tex]d=\sqrt{(y_2-y_1)^2 + (x_2 - x_1)^2}\\d = \sqrt{(1-7)^2 + (-3 - 5)^2} \\d = 10[/tex]
2)
The slope of the line can be found using the two points given.
[tex]m = \frac{y_2 - y_1}{x_2 - x_1} \\[/tex]
let's substitute the values and solve.
[tex]m = \frac{y_2 - y_1}{x_2 - x_1} \\\\m = -\frac{78}{25}[/tex]
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Can someone help me please
The next correct step of the following elimination method is (C) subtract to eliminate 'x'
What is the elimination method?The elimination method involves taking one variable out of the system of linear equations by using addition or subtraction along with multiplication or division of the variable coefficients. The problem is reduced to solving a single variable equation using the elimination method. Finding the values of x and y without changing the equations is fairly challenging. The x s cancel out and the x is removed from the equations when they are added together. As a result, it is known as the "elimination method."So, the next correct step of the elimination method:
We can see that in both equations, '-3x' is the same and this means we will cancel the x variable.Then, option (A) and option (D) is incorrect.
We know that (+ -) is always (-) but (- -) is always (+).And we need to make if -3x and +3x to cancel the 'x' variable.Thus, the correct option will be an option (C).
Therefore, the next correct step of the following elimination method is (C) subtract to eliminate 'x'
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Find the length of the missing side.
Answer:
13 cm
Step-by-step explanation:
You can use the pythagorean theorem to solve this problem. The pythagorean theorem states that [tex]a^2+b^2=c^2[/tex] where and b are the legs of a right triangle and c is the hypotenuse.
In the problem, we are given two legs, 12 and 5, so we can substitute them in for a and b and solve from there:
[tex]5^2+12^2=c^2[/tex]
[tex]25+144=c^2[/tex]
[tex]c^2=169[/tex]
[tex]c=13[/tex]
The missing side is 13 cm long
Math for Homework
Question Help Challenge You buy 1.09 pounds of apples, 0.99pounds of grapes, and 1.29 pounds of oranges. What is your total bill?
Grocery Store Prices
Item
Cost
Apples
$0.99 per
pound
Grapes
$1.19 per
pound
$1.09 per
Oranges
Savvar Egge Rigid muiago
Your total bill is $
(Round to the nearest cent as needed.)
Clasroom Continks Schoonet: math
Which expression is equivalent to 2.5 + 3a
5.5a - 29.5
3a - 32
3a - 27
5.5a - 10.5
Mak
20 9.5?
Answer:d
Step-by-step explanation:
2y - 16 = 12 solve for y and simplify your answer as much as possible
Answer:
y = 14
Step-by-step explanation:
2y - 16 = 12
add 16 to both sides:
2y - 16 + 16 = 12 + 16
2y = 28
divide both sides by 2:
2y/2 = 28/2
y = 14
Answer: y = 14 is the solution.
how do i convert (x+3)(x-4) to standard form
Answer:
solving the bracket
x×x = x²
x×-4= -4x
3×x= 3x
3×-4= -12
x²-x-12=0