Which rule which allows us to change the sign of an exponent

Step-by-step explanation:          

                                                                                       1

Given x³, we can write the equivalent expression

                                                                                    x^(-3)

                                                              1

Given y^(-4) we can rewrite this as  

                                                             y^4

Here we're applying the "rule of negative exponents."

answer: 42

use a calculator to find that 845/73 = 11.575

the whole part of the answer is 11. multiply this by 73 to get 11*73 = 803.

subtract that result from 845 to get 845 - 803 = 42

attachment?

step-by-step explanation: