Can someone help me with my homework

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

List x1, x2, x3, x4 where xi is the midpoint endpoint of the five equal intervals used to estimate the area under the curve of f(x) between x = 0 and x = 10.

Mr. t has been dating his girlfriend for one year nine months and six days how many hours has mr. t been in a relationship