Question

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

Answer 1

12. Answer: 2130

Step-by-step 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

Step-by-step 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 = $\frac{28 - 63}{16405-6562}$

      = $\frac{-35}{9843}$

      = $\frac{-0.0036}{1}$

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14. Answer: $0.28 per kWh

Step-by-step explanation:

Same reason as #13

(200, 55) and (500, 140)

rate = $\frac{140-55}{500-200}$

      = $\frac{85}{300}$

      = $\frac{0.28}{1}$