00:01
So the table gives the height as a time, as time passes for a pine tree.
00:05
We want to know h prime of t.
00:09
So this is going to be t, the true age.
00:16
So that's 14, 21, 21, 28.
00:19
We see it's going up by sevens, 35, 42, and then we'll have 49.
00:26
And then the height, we're going to have h prime of t.
00:31
So using the average rate of change, we see that we can determine what h prime of t is going to be.
00:43
So for h prime of t, we're going to have starting off 54.
00:47
It's going to be y2 minus y1, 54 minus 40 over x2 minus x1, 21 minus 14.
00:54
So that's going to give us 14 over 7, which is 2.
00:57
And then for the next one, we'll have 65 minus 4...