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# Help.

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The equation y=−0.065x2+6.875x+6200 models the amount y of sugar (in pounds per square foot) produced where x is the amount of fertilizer (in pounds per square foot) used.

What is the best approximate for the amount of sugar produced when 3 pounds per square foot of fertilizer is used? The equation p = 1.95t² + 12.25t + 125 approximates the average sale price p of a house (in thousands of dollars) for years t since 2010.

What is the best estimate for the price of the house in year 2021? Jan 19, 2018

#1
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y=−0.065x^2+6.875x+6200      Just substitute 3 for x in your equation and you should get:

y = ~6,220 lb/ft^2

2021 - 2010 = 11 Years        Substitute 11 for t in your equation and you should get:

p = 1.95t² + 12.25t + 125

p = ~\$496,000

Jan 19, 2018

#1
+2

y=−0.065x^2+6.875x+6200      Just substitute 3 for x in your equation and you should get:

y = ~6,220 lb/ft^2

2021 - 2010 = 11 Years        Substitute 11 for t in your equation and you should get:

p = 1.95t² + 12.25t + 125

p = ~\$496,000

Guest Jan 19, 2018