Witch one is greater 21 ft or 17 yd

1. what is the measure of ∠abc? what is the measure of ∠abd?

Trish receives $450 on the first of each month. josh receives $450 on the last day of each month. both trish and josh will receive payments for next four years. at a discount rate of 9.5 percent, what is the difference in the present value of these two sets of payments?

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)