Help please.

5.4n^5, the 3rd option.

Step-by-step explanation:

The first step to solve this is to use the distributive property to change this equation into: 4n^5 + 3.5n^5 - 2.1n^5.

Then, you add 4n^5 + 3.5n^5 which is 7.5n^5.

The last step is to subtract 2.1n^5 from 7.5n^5 which is 5.4n^5.

Hope this helped!

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