Plz help lol
400N + 20 <18, 000

Allie answered 72% of the questions on her math test correctly. if she answered 18 questions correctly, how many questions were on the test?

The mean temperature for the first 4 days in january was 7°c. the mean temperature for the first 5 days in january was 5°c. what was the temperature on the 5th day?

Trish receives $450 on the first of each month. josh receives $450 on the last day of each month. both trish and josh will receive payments for next four years. at a discount rate of 9.5 percent, what is the difference in the present value of these two sets of payments?