What is the meaning of the 7 in the expression?

A ball was thrown upward into the air. The height, in feet, of the ball above the ground t seconds after being thrown can be determined by the expression -16t² + 40t + 7. What is the meaning of the 7 in the expression?

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In -16t² + 40t + 7, the constant term 7 is the y-intercept of the graph. Where the graph hits the y-axis.

In other words, it is the starting height from which the ball was thrown.
The ball was thrown from an initial height of 7 feet above the ground.

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