10. Multiply the integers
14. One of the most famous blizzards in the United States was the blizzard of 1888. In one part of Nebraska, the temperature plunged from 40°F to −25°F in 5 hr. What was the average change in temperature during this time?
15. A submarine descended from a depth of −528 m to −1804 m in a 2-hr period. What was the average change in depth per hour during this time?
16. Simplify using the order of operations
5 17. Bill's daughter is 30 years younger than he is. Write an expression for his daughter's age if Bill is A years old.
18. Suppose that the amount of rain that fell on Monday was twice the amount that fell on Sunday. Write an expression for the amount of rain on Monday, if Sunday's amount was t inches.