Pls me asap for 7, 8, and 9 pls (show ) + lots of points!

7) D. since 12/27 = 20/45 = 4/9

8) B. since c= (1.4 x 2.1)/1.5

9) To divide 2 fractions we MULTIPLY the 1st one by the INVERSE of the 2nd

(Example a/b divided by c/d = (a/b x (d/c)

To that end [a : 5/8] = [3/5 divided by 2/> a = (5/8) x (3/5) x (3/2)

a= 9/16

315 miles in 5 hours.