Question

A small bird uses 5^-4 Joules of energy to sing a song. Write the amount of energy as a decimal.
a. 0.0004 c. 0.0016
b. 0.00016 d. 0.000016

Answer 1

The answer is c.
We just have to apply the law of exponents:
$=\frac{1}{5^4}$
That´s equal to:
$=\frac{1}{625}=0,0016$