The length of a wall on a picture is 4 inches. The real wall is 72 inches long. What is the scale factor from the picture to the real wall? (How many times longer is the real wall?)
A.12
B.18
C.20
D.4

Asailor is looking at a kite. if he is looking at the kite at an angle of elevation of 36and the distance from the boat to the point where the kite is directly overhead is 40 feet, how high is the kite?

Complex numbers multiply √-4 * √-25 and show all intermediate steps. alternative notation is sqrt(-4) * sqrt(-25).

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