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suter [353]
4 years ago
14

A student has a 90, 84, and an 86 on their first 3 tests. What possible scores would the student need

Mathematics
1 answer:
Ugo [173]4 years ago
4 0
The student would have to score 100% on their next test to brung their average up to 90. Here is why;
90+84+86=260
(260+?)/4=90
(260+100)/4=90
360/4=90
This is done to get the mean (or average) of a group of numbers by adding all the numbers and dividing by the amount of numbers you added together. Here it is divided by 4 because of the three tests he has taken and the test he will take.
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A smoke jumper jumps from a plane that is 1700 ft above the ground. The function y = -16t2 + 1700 gives the jumper's height y in
lakkis [162]

Answer: (A) 6.6 sec (B) 6.89 sec

<u>Step-by-step explanation:</u>

    y    = -16t² + 1700

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  -700 = -16t²

 <u> ÷-16  </u>   <u>÷-16 </u>

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***********************************

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4 0
3 years ago
Find the inverse of y = 3x^2 - 5
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Read 2 more answers
Original price of a CD: $20.00 <br> Discount 42% <br> Tax 6%
vodomira [7]
First, we can subtract the discount from the original price. Divide the discount (42%) over 100.

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Next, we need to multiply. It's basically asking what 42% of 20 is. 

0.42 × $20 = $8.40

Now, we know that we will have $8.40 on the CD because of the discount. We can subtract the saved amount from the original amount to get the price.

$20 - $8.40 = $11.60

You will pay $11.60 for the CD without taxes.

----------

Now to add the taxes.... To do this, do the same first step we did when finding the discount price. 

6/100 = 0.06

Multiply. Like I said, you can think of it as, '6% of 11.60'. 

0.06 × 11.60 = $0.70

Last step is to ADD. Since taxes add more money onto the current price, we will have to add.

$11.60 + $0.70 = $12.30

---------

The total price of the CD will be: $12.30.
3 0
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