Ireally need on this one : ( i need an answer asapmultiply r^2 + 7r + 10 / 3 by 3r - 30 / r^2 - 5r - 50 a. r + 2 b. 7r^2 - 20r - 300 / -5r - 5 c. (r + 5)( r + 2) / (r + 10) d. 3r + 6 / 2

We want to multiply  by , and simplify.

The first thing we do in this type of problems, is factorize as much as possible, and see what cancels out. 

can be factored into (r+2)(r+5) as 2 and 5 are two numbers whose sum is 7, and product is 10.

Similarly can be factoredinto (r-10)(r+5) as -10 and 5 are two numbers whose sum is -5, and product is -50.

Last, (3r-30) can be factored as 3(r-10). 

Thus the product is equal to:

, 

so canceling all equal terms in the numerator and denominator we are left with 
                                         r+2.

A) r+2