Distribute the exponent in the numerator:
Then if , we can cancel one of each in the numerator and denominator:
Finally, the square of 10 is 100, and 100 divided by 5 is 20, so we're left with (C),
1 meter=100 centimeter
The pier is 20000 centimeters.
20000/80=250
250 boards were used.
Sorry I couldn’t write here so here is the picture
7/21 for the first and 9/27 for the second
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