Question

The question says; shown here is a mathematical step taken when solving an equation. Identify the mathematical reason or property used to simplify from the first step to the second step.

Answer 1

7(A+13) = 7*A + 7*13 = 7A + 91.
As we can see, the first step was expanded to the second step. So this is the distributive property.

Answer 2

distributive property