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Arlecino [84]
4 years ago
6

A student computed the average of her 7 test scores by adding the scores together and dividing this total by the number of tests

. The average was 87. On her next test, she scored a 79. What is her new test average?
Mathematics
1 answer:
mina [271]4 years ago
7 0
After the new test, she now has taken 8 tests.
Set it up just like when finding the average:
(87+79)/8
Solve for the new test average
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x^5-8x^3-9x\\\\[Factor]x(x+3)(x-3)(x^2+1)\\\\[Set all the items equal to 0.]x = 0\\\\x+3=0\\x=-3\\\\x-3=0\\x=3\\\\x^2 +1=0\\x^2=-1\\x=i,-i

The 5 roots are 0, -3, 3, i, and -i.

⭐ Answered by Hyperrspace (Ace) ⭐

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C

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pentagon [3]
What we know:
Mrs Lemke has a total of 10 2/3 oz of fertilizer
3/4 oz fertilizer per plant

What we need to find is left over fertilizer after equally distributing as much 3/4 oz of fertilizer per plant.

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The first option. x=12/5
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