There are 20 golf balls in a bag, and 2 of the golf balls are white. the rest are yellow sherry randomly chooses golf balls, looks at the colors and returns it to the bag. she mixes up the golf ball and randomly selects another one. what is the probability that sherry selects a yellow ball both times? write your answer as a percent.

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

In need of in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.

The mean finish time was 185.52 with a standard deviation of 0.327 minute. the winning car driven by chris finished in 185.13. the previous year race had a mean finish time of 110.3 with a standard deviation of 0.106. the winning car that year driven by karen finished in 110.13 minutes. find their respective z-scores. chris - z-score karen “- z-score