00: 00 ashley’s math average decreased 12 points to 78. then she completed an extra credit assignment and raised her final average by 5 points. how did ashley’s average change? what was her starting average? what was her final average?

we are given

Ashley's average decreased by 12 points

Average after decreasing is 78 points

Then she completed an extra credit assignment and raised her final average by 5 points

(A)

Ashley's average will only increased when it's last assignment will get more than average of previous assignment points

Here , it is increasing aveage by 5 points

so, it's last assignment will have more than 78 points

then only it's final average will increase

(B)

Ashley's average decreased by 12 points

Average after decreasing is 78 points

so, previous average = 78+12=90 points

(C)

Final average = average after decreasing + average raised by extra credit assignment

so, we get

Final average =78+5

Final average =83Answer

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so

step-by-step explanation:

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a reflection across the x axis and a 90 degree rotation left and right.