For 2 just want to make sure answer is 2/3a. Need help on 3 don't know how to do it. Thanks

2. Assume that a is a positive constant. Evaluate the dt definite integral o V3t + a2 3. Let R be the region under the straight line y = f(x) =4x, lying between the origin and the vertical line x -2. Find the number a for which the vertical line x = a bisects the region R. This means that half the area of R is to the left of x = a , and the other half is to the right of x = a