Hi please respond and help very quickly with math homework please

Question

1.) A carpet cleaning business has 100 customers when they charge $125 for a cleaning. Research shows that every $5 reduction in price attracts another 20 customers. Which equation could be used to represent this situation, where x is the price per cleaning and R(x) is the total revenue?

A.) R(x) = −4x2 + 600x

B.) R(x) = −2x2 + 400x

C.) R(x) = 2x2 − 400x

D.) R(x) = 4x2 − 600x

2.) The cost of renting a fishing boat is $25 per hour for the first 7 hours, $10 per hour for the next 10 hours, and $5 per hour for any additional hours. Identify the cost of renting the boat for 30 hours.

A.) $150

B.) $425

C.) $325

D.) $340

Please please just explain and solve please

Answer 1

25(7) + 10(10) + 5(13) = 175 +100+ 65=$340

Answer D is correct

7+10+13 = 30 hours

25x7 + 175

10x10=100

13x5 = 65