Problem 9.4. In the next few problems we're just going to focus on one function: f(t)=3t. We're using the variable t instead of x because we want to use x for something else later.(a) Compute 013tdt by drawing the curve y=3t, shading the region under the curve on the interval 0t1, and computing its area.(b) Likewise, compute 023tdt by drawing the relevant picture, shading the appropriate region, and finding its area.(c) Do the same for 033tdt.