1/4 x 1/4 - 1/4 ÷ 1/4 ÷ 1/4 ÷ 1/4 cuanto es pls explicado?

Ricky takes out a $31,800 student loan to pay his expenses while he is in college. after graduation, he will begin making payments of $190.66 per month for the next 30 years to pay off the loan. how much more will ricky end up paying for the loan than the original value of $31,800? ricky will end up paying $ more than he borrowed to pay off the loan.

1. find the area of the unshaded square 2. find the area of the large square 3. what is the area of the frame represented by the shaded region show

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.