Ricardo has a $50 gift card for an electronic store. he also has a coupon good for $10 off his purchase. let a represent the amount of merchandise ricardo can buy from the store using his gift card and coupon. write and solve any quality to represent the situation

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

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota