Sunday, December 11, 2011

More Test Questions...Again

The function y= -64(x - 3)2 + 400 models a store's profits in dollars on a certain food item where
x is the price of the item. What should the store charge for the item to maximize the
profit? What is the maximum possible profit that can be earned according to the model?

Use the table of values for the quadratic function below to determine between which two
x values f(x) will have a zero.
2 5 8 11 14
f(x) -2 -5 10 43 94

Find the vertex for the function:

y= x2 + 4x - 7

The path of a toy rocket launched from an observation tower is modeled by the equation:
h(t) = -16t2 + 48t + 64 where t is time in seconds and
h is height in feet. In how many seconds will the toy rocket first reach 90 feet?

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