Monifer used susbstitutuon to solve a system of equation which equation could be the result of her first step. 3a+b=225

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?

The probability that an adult possesses a credit card is .70. a researcher selects two adults at random. by assuming the independence, the probability that the first adult possesses a credit card and the second adult does not possess a credit card is:

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'