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sergiy2304 [10]
2 years ago
6

Plz help Jessica received scores of 86, 88, 92, and 90 on her first four tests in

Mathematics
1 answer:
Ierofanga [76]2 years ago
5 0
To find the average you have to add 86, 88, 92, and 90 together and divide it by four.

86+88+92+90= 356
356/4= 89

ANSWER= 89
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\begin{array}{lcccl} &\stackrel{solution}{quantity}&\stackrel{\textit{\% of }}{amount}&\stackrel{\textit{liters of }}{amount}\\ \cline{2-4}&\\ \textit{1st solution}&x&0.20&0.2x\\ \textit{2nd solution}&y&0.60&0.6y\\ \cline{2-4}&\\ mixture&100&0.44&44 \end{array}~\hfill \begin{cases} x+y=100\\\\ 0.2x+0.6y=44 \end{cases}

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