Answer:
2100 units
Explanation:
We want to find the y-intercept of the function
which can be used to model the height, y, of a parachute jumper x seconds after she jumps from an airplane.
To find the y-intercept, you substitute
into the equation.

Multiply by zero to get:

Add zero to obtain:
'

Therefore the y-intercept, which is the initial height is 2100