5) Find all values of x for which the slope of the line tangent to the...

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5) Find all values of x for which the slope of the line tangent to the function f(x)=(x-18x + 45) is horizontal. (12 pts} 6) The average daily high temperature of Philadelphia, PA t years from now is predicted to be able to be modeled by the function P(t) = 40t 4) where P(t) is in degrees Fahrenheit for t 5. = 64.25+ 0.004t+ In 11t +4, a) Find the average high temperature 100 years from now. {2 pts} b) Find the rate of change of the average high temperature 60 years from now and include the appropriate units in your answer. Round your answer to 4 decimal places. {10 pts} 5) Find all values of x for which the slope of the line tangent to the function f(x)=(x-18x + 45) is horizontal. (12 pts} 6) The average daily high temperature of Philadelphia, PA t years from now is predicted to be able to be modeled by the function P(t) = 40t 4) where P(t) is in degrees Fahrenheit for t 5. = 64.25+ 0.004t+ In 11t +4, a) Find the average high temperature 100 years from now. {2 pts} b) Find the rate of change of the average high temperature 60 years from now and include the appropriate units in your answer. Round your answer to 4 decimal places. {10 pts}