Charge passing through a cross section for a time varying current

[superslow991]

Homework Statement

The current in a wire varies with time according to the equation I(t) = 6.00 A + (4.80 A/s)t, where t is in seconds. How many coulombs of charge pass a cross section of the wire in the time period between t = 0.00 s and 3.00 s

Homework Equations

I=dq/dt

The Attempt at a Solution

So since were calculating the current, i solved for q=(integral)I*dt which was the integral from 0 to 3 (6.00A+(4.80)t and got the answer q = 75.6 which is wrong. The answer is q= 39.6.
I know the problem lies in the math but I am not sure where I am wrong.

 

[TomHart]

Can you write out your steps in performing your integral so we can see where you made a mistake.

Edit: Maybe you attempted to post a picture and it didn't show up.

 

[superslow991]

Can you write out your steps in performing your integral so we can see where you made a mistake.

Edit: Maybe you attempted to post a picture and it didn't show up.

Actually i think i input my equation wrong i got the right answer