Answer:
2100 units
Step-by-step 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
No, because here mom is adding in 3.5 more pages when it say only 1.5. So she'll be able to read 30 pages because 1.5 and 20 pages of her friends is 30. So your answer is that her mom is wrong.
I hope this helped! I gave an explanation and an answer. You're Welcome!
The solution is you need to subtract the y axis and x axis
