I have to simplify but I’m doing something wrong and when I looked it up it said used AC method which is a term I never heard in my class. Please help

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.

To finance her community college education, sarah takes out a loan for $2900. after a year sarah decides to pay off the interest, which is 4% of $2900. how much will she pay

Which is the scale factor proportion for the enlargement shown?