Please tell me how to solve below 2 Optimization problems

1)

Suppose a business sells Whatchamacallits. The total cost is given byC(x)=50000+6x

and the total revenue is given by R(x)=x2+1000x where x is the number of Whatchamacallits sold and C and R are both in dollars. If profit is given by Revenue mins Cost,

What is the maximum profit the business could make from Whatchamacallits sales?

2)

A farmer wishes to build a fenced in enclosure along the side of the barn. The enclosure should be a rectangular, and the barn will serve as one side of the region

(so the enclosure cannot be longer than the barn). The farmer has enough fence for 1000feet of fence. If the barn is 200 feet long, what is the maximum area of the enclosure in ft2?

W Barn L Enclosure 200 ft W