What is the formula to find out how much $10 now will be worth if the inflation rate is 3.5%.

10(1+3.5%)=10.35 increased by.35 in a year

The answer fam isPart A: Company A: y=30x+13 Company B: y=28x+15 
X: number of mattresses 
Y: total cost 
Part B: 

Company A: 30(4)+13= 133 Company B: 28(4)+15= 127 

Company B cost less than Company A does when you purchase 4 mattresses 
Part C: 
Company A: 30(7)+13= 223 
Company B: 28(7)+15= 211 
You save $12 by using the services of Company B instead of Company A to clean 7 mattresses