I can answer question two.
2.) find the instantaneous velocity when t=1
The derivative is 10-3.72t
t=1 gives 6.28 m/s
questions: if a rock is thrown upward on the planet mars within velocity of 10m/s, its height in meter t second later is given by y=10t-1.86t^2.
1.) find the average velocity over the time interval
a) [1,2]
b) [1,1.5]
c) [1,1.1]
d) [1,1.01]
e) [1, 1.001]
2.) find the instantaneous velocity when t=1