Solve.
-Cindy has scores of 74,80,84 , and 89 on her biology tests. Use a compound inequality to find the range of scores she can make on her final exam to receive a C in the course. The final exam counts as two tests, and a C is received if the final course average is from 70 to 79 .
A) $70 \leq \text { final score } \leq 79$
B) $93 \leq \text { final score } \leq 147$
C) $11.5 \leq \text { final score } \leq 34$
D) $46.5 \leq \text { final score } \leq 73.5$

Question

Solve.
-Cindy has scores of  74,80,84 , and 89 on her biology tests. Use a compound inequality to find the range of scores she can make on her final exam to receive a  C  in the course. The final exam counts as two tests, and a  C  is received if the final course average is from 70 to 79 .
A) $70 \leq \text { final score } \leq 79$
B) $93 \leq \text { final score } \leq 147$
C) $11.5 \leq \text { final score } \leq 34$
D) $46.5 \leq \text { final score } \leq 73.5$

Quizplus · Accepted Answer

The final exam counts as two tests, so the average is calculated as $(74 + 80 + 84 + 89 + 2x)/6$. To receive a C, this average must be between 70 and 79. Solving $70 \leq (74 + 80 + 84 + 89 + 2x)/6 \leq 79$ gives the range $46.5 \leq x \leq 73.5$.

Solve -Cindy Has Scores of 74,80,84 , and 89 70≤ final score ≤7970 \leq \text { final score } \leq 7970≤ final score ≤79

Solve
-Cindy Has Scores of 74,80,84 , and 89 $70 \leq \text { final score } \leq 79$