If a circle has a radius of 10 how do u find the area

Which graph represents the solution of the inequality?

Okay so i didn't get this problem petro bought 8 tickets to a basketball game he paid a total of $200 write an equation to determine whether each ticket cost $26 or $28 so i didn't get this question so yeahyou have a good day.

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g