So if you have to pay 55 out front and then continue to pay 19.50 monthly the equation will look like this: 19.50*m + 55 = x (M stands for month) She has 250 dollars to spend so add that in for x <span>19.50*m + 55 = 250. Use inverse operations. 250-55 and 55-55 19.50*m = 195 195/19.50 and 19.50/19,50 m=10 Your answer is 10</span>