Which number is a rational number?

13/16 sqrt
34 sqrt
49 sqrt
9/2 sqrt

John can eat 10 cookies in 1/2 hr how many cookies can he eat in 45 minutes make a proportion and solve

Evaluate cos2θ for cosθ = square root of 3/2

Need ! the total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?