Math

1.a pizza place offers 5 different cheeses and 10 different toppings. in how many ways can a pizza be made with 2 cheese and 3 toppings?
a.1200
b.1000
c.800
d.600

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field