20 points for anyone to answer correctly

Lets solve this step by step. A is not a positive because (-9)*8=-72. B if positive because -12*(-3)=36. A negative times a negative is a positive. C is also a positive because (-2/5)*(-4) is a positive. D is not a positive because like A, one is negative and the other number is positive. A negative times a positive is a negative. I hope it helped!

We need to solve this by looking at each answer choice.

A. 

To solve for w, we need to multiply by -9 on both sides.

So, 

This is not a positive solution. So eliminate A.

B. 

To solve for y, we need to multiply by -3 on both sides.

So, 

This is a positive solution. This is one of our answers.

C. " alt="-4\times \frac{-5}{2}= -\frac{2}{5}z\times -\frac{5}{2}\\\\z = 10" />" />

We need to multiply by -5/2 on both sides to solve for z.

This is a positive solution. This is one of our answers.

D. 

We need to multiply by 7 on both sides to solve for x.

So, 

This is a negative solution. So this is not the answer.

So your final answer is B and C.