Given three tangent circles A, B, and C with AC=b, AB=c and BC=a, find the radius of circle A in terms of a, b, and C.

Which statement best describes the polynomial

An initial investment of $100 is now valued at $150. the annual interest rate is 5%, compounded continuously. the equation 100e0.05t = 150 represents the situation, where t is the number of years the money has been invested. about how long has the money been invested? use your calculator and round to the nearest whole number. years

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