What is the area of a circle with a diameter of 26 inches?

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

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.

How can writing phrases as algebraic expressions you solve problems?