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professor190 [17]
3 years ago
11

The science club charges $6.50 per car at their car wash. How many cars do they have to wash to earn at least $500?

Mathematics
1 answer:
Anastasy [175]3 years ago
6 0

Answer: 77 cars

Step-by-step explanation: 6.50 * 77 = 500.5

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Please help I don’t know the answer :(
gogolik [260]

Answer:

When x=8, y=-6. When x=10, y=0

Step-by-step explanation:

y=3x-30\\x^2+y^2=100

You can plug the given y value into the second equation to get:

x^2+(3x-30)^2=100\\x^2+9x^2-180x+900=100\\10x^2-180x+800=0\\10(x^2-18x+80)=0\\10(x-8)(x+10)=0\\x= 8, 10\\y= -6, 0

Hope this helps!

6 0
3 years ago
Read 2 more answers
Billy received a raise after his first year on the job to $45,000 from his initial salary of $42,400. What was his real raise st
solong [7]

Billy get 5.9% raise after completing first year.

<h3>What is PERCENTAGE?</h3>

A percentage is a number or ratio that can be expressed as a fraction of 100. If we have to calculate percent of a number, divide the number by the whole and multiply by 100.

Here, Billy's initial salary = $ 42,500

After raise, salary become $ 45,000

Change in salary = Raised salary - Initial salary

                            = 45000 - 42500

                            = $ 2500

% Change = change / initial salary  X 100

                  = 2500 / 42500 X 100

                  = 0.0589 X 100

                  ≈ 5.9 %

Thus, Billy get 5.9% raise after completing first year.

Learn more about Percentage from:

brainly.com/question/14979505

#SPJ1

7 0
2 years ago
Find the height <br> 11in 14in<br> h=
jeka57 [31]

Answer:

h = \sqrt{72}in

Step-by-step explanation:

We have a right triangle with long side of 11in and smaller sides 14in/2=7in and h.

We know that

h^2 + (7in)^2 = (11in)^2\\h^2 = 121in^2 - 49in^2 = 72in^2\\h = \sqrt{72}in

6 0
3 years ago
Suzanne needs material for her school project. She buys 5.50 yards of material at $3.87 a yard. What is the total cost of the ma
ASHA 777 [7]
   5.50
x 3.87
----------
21.285
5 0
3 years ago
Read 2 more answers
Anybody knows the answer real quick
eduard

Answer:

I think it's 3

Step-by-step explanation:

To calculate the gradient equals to

y(1)-y(2)

-----------

x(1)-x(2)

So - 5 - 1 = - 6

6 - 2 = 4

-6 - 3

--- = ----- x

4 2

And the first y intercept is 1 so I guess it's 3.

Just for refernece, not sure if I'm correct. Sry

8 0
3 years ago
Read 2 more answers
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