please provide explanation.

A landscape architect plans to enclose a 3000 square-foot rectangular region in a botanical garden. She will use shrubs costing $30 per foot along three sides and fencing costing $20 per foot along the fourth side. Find the dimensions that minimize the total cost. Draw a picture. Show the formulas that you use. Trial and error will not give full credit for the problem. Dimensions The function s(t) = 13 - 20t2 + 128t -280 describes the motion of a particle at any time t 2 0. Find each Velocity function: Acceleration function: The times at which the particle changes direction: Use u-substitution to integrate each of the following. Be sure to show all work. ich a. Sxe 4x2-3 dx b. [ x2(x3 -4) " dx