Could you help me?

Question

1. 4r3/10 * 25/16r2

2. 4p + 16/5p ÷ p + 4/15p3

3. x2 + 2x - 35/x2 + 4x - 21 * x2 + 3x - 18/x2 + 9x + 18

Answer 1

I guess you want to simplify!

I will do the first and 2nd you do the rest

(4r^3/10)(25/16r^2)= 5r/8

2)  [4p+16]/5p ÷ [p+4]/15p^3 = [4p+16]/5p × 15p^3/[p+4]

                                             = 4[p+4]/5p   × 15p³ /[p+4]

                                             = 12p²