# Homework Help: How to find the integral with only a graph given

1. Mar 9, 2013

### Sneakatone

how do you graph an integral?

(a) Evaluate g(x) for x = 0, 4, 8, 12, 16, 20, and 24.

(b) Estimate g(28). (Use the midpoint to get the most precise estimate.
since theres no equation give I dont know how to integrate the function.

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Last edited: Mar 9, 2013
2. Mar 9, 2013

### vela

Staff Emeritus
Why did you think g(4)=4? If you're just guessing, you need to go back and study some more before even attempting the problem.

3. Mar 9, 2013

### Sneakatone

is the a way you can help me find the integral from just the graph?

4. Mar 9, 2013

### SteamKing

Staff Emeritus
What does this integral represent geometrically?

5. Mar 10, 2013

### Sneakatone

the area , in this case most of them are triangles

6. Mar 10, 2013

### vela

Staff Emeritus
Do you know how to calculate the area of a triangle?

7. Mar 10, 2013

### SammyS

Staff Emeritus
What is the area of each small rectangle on the graph ?

8. Mar 10, 2013

### Staff: Mentor

You can fit analytic functions piecewise to f(t), and then integrate analytically. The variation, for the most part, is linear in the various sections.