Find AC a.4 b.15 c.14 d.12

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

When the ball has traveled a distance of

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