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 = [tex]\frac{28 - 63}{16405-6562}[/tex]
= [tex]\frac{-35}{9843}[/tex]
= [tex]\frac{-0.0036}{1}[/tex]
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14. Answer: $0.28 per kWh
Step-by-step explanation:
Same reason as #13
(200, 55) and (500, 140)
rate = [tex]\frac{140-55}{500-200}[/tex]
= [tex]\frac{85}{300}[/tex]
= [tex]\frac{0.28}{1}[/tex]
