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Answer:
Vertex form:
Height expressed as a function of time:
Step-by-step explanation:
We have been given that the ball is 4 ft above the ground when she hits it.
This means that initial value (y-intercept) of ball is 4.
We are also told that three seconds later it reaches its maximum height of 148 ft. This means .
We know that vertex form of a parabola is in format .
Let us solve for a using our given information.
Therefore, the vertex form of our given function would be .
Since we need height as a function of time, so we will get:
Therefore, the function where height is expressed as a function of time would be .