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Marta_Voda [28]
3 years ago
11

David made these grades on 5 math tests: 93, 87, 84, 96 and 80. what must he make on the 6th test to have an average of 90?

Mathematics
1 answer:
Rasek [7]3 years ago
3 0
The total of the 5 tests was 444, however the 6th test would have to be 96 in order to divide the 6 tests into a whole number 540 to get an average of 90
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Read 2 more answers
Solve 2x + 3y = 16<br> 4x+10y = 40​
Aleksandr-060686 [28]

Answer:

x = 5, y = 2

Step-by-step explanation:

First, find the value of x in respect to y:

2x + 3y = 16
2x = 16 - 3y

x = 8 - 3/2y

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4(8 - 3/2y) + 10y = 40

Then, distribute and solve for y:

32 - 6y + 10y = 40
32 + 4y = 40
4y = 8
<u>y = 2</u>

Now that we know what y equals, we can substitute the value of y in the equation to find x:
2x + 3(2) = 16
2x + 6 = 16
2x = 10

<u>x = 5</u>


8 0
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