Prove that 1-sin^4a/cos^4a=1+2tan^2a

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.

Which type of graph would allow us to quickly see how many students between 100 and 200 students were treated?

Percent increase and decrease. original number: 45 new number: 18