Question

Question 3(Multiple Choice Worth 4 points)
Which expression is equivalent to 73.7-57
0 72
0 77
17
글

Answer 1

Answer: $\frac{1}{7^{2}}$

Step-by-step explanation:

Using the exponent rule $a^{b} \cdot a^{c}=a^{b+c}$, we get that

$7^{3} \cdot 7^{-5}=7^{-2}$

Then, using the exponent rule $a^{-b}=\frac{1}{a^b}$, we get that

$7^{-2}=\boxed{\frac{1}{7^{2}}}$