Hey I have posted a picture the method I use to solve simultaneous equations is change the sign and follow the new sign.
This involves changing the sign for the second equation and solving it
V=πr2h is how you find it
Answer:
Instantaneous Velocity at t = 1 is 20 feet per second
Step-by-step explanation:
We are given he following information in the question:

B) Instantaneous Velocity at t = 1

A) Formula:
Average velocity =

1) 0.01

2) 0.005 s

3) 0.002 s

4) 0.001 s

Absolute value is a positive number
So -7-1 = -6
Answer 6