The weekly marginal revenue from the sale of x pairs of tennis shoes is given by the equation below, where R(x) is revenue in dollar R'(x)=30-0.02x+ 400 x+1' R(0)=0 Find the revenue function. Find the revenue from the sale of 1,000 pairs of shoes. Find the revenue function, R(x). R(x)= (Use integers or decimals for any numbers in the expression.)