Which of the following equations is the result of cross multiplying the given proportion?

4/k+3=-2/k-5

-2(k-5)=4(k+9)
(-2)(4)=(k-5)(k+9)
-2(k+9)=4(k-5)

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.