What's the answer to find y when x=9 if y varies directly as the square of x ,and y =100 when x= 5

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?

Due to a packaging error, 4 cans labeled diet soda were accidentally filled with regular soda and placed in a 12 pack carton of diet soda. two cans were randomly selected from this 12 pack. what is the probability that both cans were regular soda?

Mrs.sling bought a pound of green beans for $1.80. how much will mrs.tennison pay for 3 1/2 pounds of green beans?