Question 173033
Define a variable and write a quadratic function to describe each situation.
30. the product of two numbers whose sum is 45
x*(45-x) = Product
45x - x^2 = Product
31. the area of a circle in terms of its radius
Area = pi*r^2

32. the product of two numbers whose difference is 15 
Product = n*(n+15) = n^2 + 15n