A ball is thrown upward from the top of a building. The function below shows the height of the ball in relation to sea level, ft, in feet, at different times t in seconds: f(t) = -16t2 + 34t + 80 The average rate of change of f(t) from t = 5 seconds to t = 7 seconds is _____ feet per second.

Question

A ball is thrown upward from the top of a building. The function below shows the height of the ball in relation to sea level, ft, in feet, at different times t in seconds:  f(t) = -16t2 + 34t + 80  The average rate of change of f(t) from t = 5 seconds to t = 7 seconds is _____ feet per second.

anonymous · Answer

Hello?

anonymous · Answer

@jdoe0001

jdoe0001 · Answer

$\bf slope = {\color{green}{ m}}= \cfrac{rise}{run} \implies \cfrac{{\color{blue}{ y_2}}-{\color{blue}{ y_1}}}{{\color{red}{ x_2}}-{\color{red}{ x_1}}}\implies \cfrac{f(7)-f(5)}{7-5}\impliedby \textit{rate of change}$

anonymous · Answer

When I do that I get 158

jdoe0001 · Answer

hmmm

anonymous · Answer

Am I right

anonymous · Answer

@jdoe0001

jdoe0001 · Answer

sorta   yes   but one sec  should be a negative 158

anonymous · Answer

Oh ok because it is falling down the building?

jdoe0001 · Answer

$\bf \cfrac{-466-(-150)}{7-5}\implies \cfrac{-\cancel{ 316 }}{\cancel{ 2 }}\implies -158$
yeap

anonymous · Answer

Ok thank you very much, can you just help me with one more question

jdoe0001 · Answer

sure... you can just post anew, if I dunno.. someone else may help and we can revise each other