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3 years ago

70 points

Mathematics

2 answers:

Verizon [17]3 years ago

3 0

Answer:

500

All of the above

paying your balances off in full

make credit card purchases that you know you can pay back within a month

0% interest for 1 year and 12% interest after that

paying your balances off in full

all of the above

Step-by-step explanation:

xenn [34]3 years ago

3 0

Answer:

Step-by-step explanation:

I just took the test and got 100%

1) 500

2) all of the above

3) paying your balance of in full

4) make credit card purchases that you know you can pay back within a mont

5) 0% interest for 1 year and 12% interest after that

6) 0% interest for 1 year and 12% interest after that

7) paying your balance in full

8) all of the above

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Krystal can wax a floor in 16 minutes. Perry helped her and it took 5.76 minutes. How long would it take perry to do it alone?

finlep [7]

<span>Krystal's rate = 1 floor in 16 min. = 1/16 floors per min.

Working together their rate = 1 floor in 5.76 min. = 1/5.76 floors per min.

We need to determine Perry's rate, so we need to equate their combined rate with the sum of the individual rates.

Let Perry's time = x

In equation form, we can write:
1/16 + 1/x = 1/5.76
Solve for x:

(x+16)/16x = 1/5.76 -> 5.76(x+16) = 16x -> 10.24x = 92.16 -> x = 9

So, Perry would take 9 mins. to do the floor alone.

I hope this helped!
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2 years ago

Sofia hits a softball straight up. the equation h= -16t^2 + 90t models the height h, in feet, of the ball after t seconds. How l

andrezito [222]

It is in the air 5.625 seconds.

Using the quadratic formula,

$t=\frac{-b\pm \sqrt{b^2-4ac}}{2a}
\\
\\=\frac{-90\pm \sqrt{90^2-4(-16)(0)}}{2(-16)}
\\
\\=\frac{-90\pm \sqrt{8100-0}}{-32}
\\
\\=\frac{-90\pm \sqrt{8100}}{-32}=\frac{-90\pm90}{-32}
\\
\\=\frac{-90+90}{-32}\text{ or }\frac{-90-90}{-32}=\frac{0}{32}\text{ or }\frac{-180}{-32}
\\
\\=0\text{ or }5.625$

0 is when the ball is first launched, 5.625 is when it hits the ground again.

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