If a rock is thrown upward on the planet Mercury with a velocity of 12 m/s, its height in meterstseconds later is given byy= 12t- 1.86t^2.

Find the average velocity for the time period [1, 2].

Well, I did it and got it right:

Plugged 1 into the equation and got 10.14. Then plugged 2 in and got 16.56.

16.56-10.14 = 6.42

Now for the second part: [1, 1.5].

I did the same thing and got 13.185-10.14 = 3.675 and I got it wrong for some reason...

UPDATE: Haha, I forgot to divide by .5. NVM Then, please delete this thread.