Clearly indicate each substitution, and show your computation for the differential du explicitly. Then, change the limits of integration to match the differential (i.e., to be u-values). Then, anti-differentiate the integrand as a function of 1 to compute the exact value of the integral and a decimal approximation to two decimal places. 7. S 24.x 4x+1 dx 8. 24 4x+1 dx 9. -0.22 +3 L dx