Question

Which pair of

expressions are
equivalent?
A. 8(2r) and 10r B. 6r + 3 and 9r
C. 9(3r-4) and 27r - 36
D. r+r+r+r+r and r^5

Answer 1

Well...

A.

8(2r) & 10r

This is incorrect because the second option would be if you added 8r to 2r, not multiplied 8 to 2r.

B.

6r + 3 & 9r

This is incorrect because you cannot add the 3 to 6r, because they are different.

C.

9(3r-4) & 27r - 36

This is correct because the two options are equivalent.

D.

r+r+r+r+r & r^5

This is incorrect because the first part would need to be r x r x r x r x r for it to be true.

yw.