Ms. U. S. Bonds invested a total of $4500, some at 9% per year and the rest at 6% per year. The return
from the 9% investment exceeds that from the 6%
investment by $180. How much did she invest at
each rate?

b. would be the answer : )

step-by-step explanation:

step 1: add -16x to both sides.

16x−4y+−16x=64+−16x  

−4y=−16x+64

step 2: divide both sides by -4.

−4y /-4 = -16x + 64/-4

answer:   y=4x−16

hope i'm right

d. corresponding side lengths in similar triangles are proportional in length.

step-by-step explanation:

the answer is b