4. In Knoxville, the temperature rises 4° from 4 P. M. To 5 P. M. Then the temperature drops 7º from 5 P. M. To 6 p. M. In Cleveland, the temperature drops 6º from 4 P. M. To 5 P. M. Then the temperature drops 2 from 5 P. M. To 6 P. M. a. What expression represents the change in temperature for Knoxville? b. What integer represents the change in temperature for Knoxville? c. What expression represents the change in temperature for Cleveland? d. What integer represents the change in temperature for Cleveland?

a. The expression for Knoxville is (+4) + (-7)

b. The integer represents the change for Knoxville is - 3

c. The expression for Cleveland is (-6) + (-2)

d. The integer represents the change for Cleveland is - 8

Step-by-step explanation:

* Lets explain how to solve the problem

- In Knoxville, the temperature rises 4° from 4 P. M

- Then the temperature drops 7º from 5 P. M. To 6 P. M.

∵ Word rise means positive number

∴ Rises 4 = + 4

∵ Word drop means negative number

∴ Drops 7 = - 7

∴ The change in temperature for Knoxville = (+4) + (-7)

- Remember: (+) (-) = (-)

∴ The change in temperature for Knoxville = 4 - 7 = - 3

a. The expression for Knoxville is (+4) + (-7)

b. The integer represents the change for Knoxville is - 3

- In Cleveland, the temperature drops 6º from 4 P. M. To 5 P. M.

∴ Drops 6 = - 6

- Then the temperature drops 2 from 5 P. M. To 6 P. M.

∴ Drops 2 = - 2

∴ The change in temperature for Cleveland = (-6) + (-2)

∴ The change in temperature for Cleveland = - 6 - 2 = - 8

c. The expression for Cleveland is (-6) + (-2)

d. The integer represents the change for Cleveland is - 8