Tom is paid semi-monthly. his annual salary is $78,500. how much does he receive in each paycheck?

Ineed i been stuck on this question since yesterday

Diane’s bank is offering 5% interest, compounded monthly. if diane invests $10,500 and wants $20,000 when she withdrawals, how long should she keep her money in for? round to the nearest tenth of a year.

The table below shows the angle measurements for triangle abc and triangle xyz. if triangle abc is similar to triangle xyz, what does angle z equal, in degrees?