Given f(x) =2x+3 what is the value of f(-5)

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?

What are the greatest common factor of 75 and 30