A number a multiplied b times (so a x a is b=2, a x a x a is b=3, a x a x a x a is b = 4, and so on) is written as ab.
Since 2 is multiplied 4 times, you have 24.
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16
2 x 2 x 2 x 2 = 24
Example: 2 (I don't know how to do an exponent on the computer so I'll just say what you would say out loud) to the 4th power= 2x2x2x2=16. <- that's standard form.
24
24