Question

I need help with these three problems.... please help me????

Answer 1

12. Answer: 2130

Explanation:

T = -0.01y + 10.6

9.2 = -0.01y + 10.6

-10.6 -10.6

-1.4 = -0.01y

÷-0.01 ÷-0.01

140 = y

"y" represents the number of years after 1990

1990 + 140

= 2130

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13. Answer: -0.0036° per foot

Explanation:

Since the relationship is linear, then we can set up the values as x, y coordinates and use the slope formula to find the rate of degrees over feet.

(6562, 63) and (16405, 28)

rate =
`(28 - 63)/(16405-6562)`

=
`(-35)/(9843)`

=
`(-0.0036)/(1)`

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14. Answer: $0.28 per kWh

Explanation:

Same reason as #13

(200, 55) and (500, 140)

rate =
`(140-55)/(500-200)`

=
`(85)/(300)`

=
`(0.28)/(1)`