Shown here mathematical step . identify the mathematical reason or property used to simplify from the first step to the second step.
7(a+13)
7a+91

Isee the amount was $90.00 then reduced to $75.00 , what is the percent ?

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

Axel follows these steps to divide 40 by 9: start with 40. 1. divide by 9 and write down the remainder. 2. write a zero after the remainder. 3. repeat steps 1 and 2 until you have a remainder of zero. examine his work, and then complete the statements below.