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2³⁰ + 2³⁰ + 2³⁰ + 2³⁰ =

A. 8¹²⁰
B. 8³⁰
C. 2³²
D. 2³⁰
E. 2²⁶

The expression above could be rewritten as:  4 x 2³⁰

4 can also be written as  2².

What is 2² x 2³⁰?

You should remember this basic rule:  ( x ^m ) ( x ⁿ ) = x^{( m + n )}

So the answer is 2³². The answer is (C).

source:  majortests.com