Math Question: Grace earns $5 each time she walks her neighbor’s dog. She walks the dog 5 times in one week. Then she spends $7 on a book and $9 on a building set. Write an equation to represent how much money Grace has left, m.

Solution and Answer: m = (5 x 5) – (7 + 9)

m = 25 – 63

m = $38