Which expression is equivalent to $(7nr^{2}+2nr)+(5n^{2}r+4nr)$? | Ronan SAT

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Question

Prompt

Which expression is equivalent to

(7 n r^{2} + 2 n r) + (5 n^{2} r + 4 n r)

?

12 n^{2} r^{2} + 6 n r

A

\displaystyle 12n^{3}r^{3}+6n^{2}r^{2

B

7 n r^{2} + 5 n^{2} r + 6 n r

C

35 n^{3} r^{3} + 8 n^{2} r^{2}

D