Answer:
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
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