Christine has scores of 68, 65, 75, and 78 on her algebra tests. Use a compound inequality to find the 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.

Question

anonymous · Answer

yea what's sum ,,,,,?
so

anonymous · Answer

what is your question 
?

anonymous · Answer

how i know what are you posted ,forgot it 
ok ?

anonymous · Answer

Start with this:
70 <= Grade <= 79
We need to find an algebraic expression for Grade, and we will be done.

anonymous · Answer

To calculate her grade, we would do this:
Let x be her exam schore
Grade = (68 + 65 + 75 + 78 + 2x) / 6

anonymous · Answer

What next?

anonymous · Answer

Solve
70 <= (68 + 65 + 75 + 78 + 2x) / 6 <= 79
That looks kinda ugly, i know, but I would get rid of that fraction by multiplying all sides by 6 first. A calculator could be helpful.