Jina has scored 76, 85, and 86 on her previous three tests. What score does she need on her next test so that her average (mean)
1 answer:
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Answer:
Step-by-step explanation:
we know that
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see the attached figure to better understand the problem
Triangles ABD and BCD are similar by AA Similarity Theorem
Remember that
If two figures are similar, then the ratio of its corresponding sides is proportional
so
substitute the given values
simplify
