Sally has 15 marbles in a bag. 6 are blue, 3 are red, 4 are yellow and 2 are black. what is the probability that sally draws a blue marble?

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?

Math each whole number with a rational,exponential expression

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.