Chapter 7 - Exponents and Exponential Functions - 7-3 Multipying Powers with the Same Base - Practice and Problem-Solving Exercises - Page 429: 21

$-7$

Multiply the coefficients : $-7$ X $m^{3}$ X $m^{-3}$ This becomes : $-7$ X $m^{3-3}$ (since the exponents are added while multiplying with the same base) This becomes : $-7$ X $m^{0}$ = $-7$ X $1$ Final result : $-7$