An angle measures 31.6° more than the measure of its complementary angle. What is the measure of each angle? (need 2 answers no links and pls see the pic)

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?

Having a hard time understanding this question (see attachment).

Solve this 364x-64x=300x and 12(x2–x–1)+13(x2–x–1)=25(x2–x–1)