On a map, the coordinates (2,-1) and (4,8) pass through the coordinates (1,3) and (6,2). Are they perpendicular

What is the quotient of 42/3 divided by 4 1/5

Afair die is cast four times. calculate the probability of obtaining exactly two 6's round to the nearest tenth of a percent

Jake volunteers to out his younger brother's basketball team in his free time. one of his tasks is to ensure that all the basketballs have enough air in them. given that a properly inflated basketball measures 8.8 inches across, what is the total volume of air inside six of jake’s basketballs? assume that the wall of each ball is infinitely thin.