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ACT® Math

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Difficult

Adding Exponentials

ACTMAT-RKL9XN

Which of the following is equivalent to:

$$ { 2 }^{ x }+{ 2 }^{ x }+{ 2 }^{ x }+{ 2 }^{ x } $$

A

$ { 2 }^{ x+2 } $

B

$ { 8 }^{ x } $

C

$ { 2 }^{ 2x } $

D

$ { 2 }^{ 4x } $

E

$ { 4 }^{ x } $