If a circle has a diameter of 30 meters, which expression gives its area in square meters?

a.15^2 x ï€
b. 30 x ï€
c. 30^2 x ï€
d. 15 x ï€

Brook states that the distance on the line is 4 units. caleb states that the whole line does not have a distance because it continues on forever. vivian states that the line is 6 units long. which distance did brook measure? which distance did vivian measure?

Can someone pls ! pls answer all. no explanation needed..

The number if marbles of different colors stored in a hat is listed below: 4 red marbles 10 green marbles 7 blue marbles. without looking in the hat, dan takes out a marble at random. he replaces the marble and then takes out another marble from the hat. what is the probability that dan takes out a blue marble in both draws?