math
posted by Anonymous .
If a rock is thrown upward on the planet Mercury with a velocity of 11 m/s, its height in meters t seconds later is given by y = 11t  1.86t sqaure
a : Find the average velocity over the given time intervals: [1, 2] , [1, 1.5] , [1, 1.1] , [1, 1.01] [1, 1.001]
b: Estimate the instantaneous velocity when t = 1.

I suppose you have not seen the answer to the original post.
Here it is:
http://www.jiskha.com/display.cgi?id=1283034793