Which of the following represents a line that is perpendicular to the line with the equation y=-2x-5 a. y-2=-½ (x-3)
b. x-2y=12
c.-2x+4y=10
d. y-2=2(x+5)

The ratio of the ages (in years) of three children is 2: 4: 5. the sum of their ages is 33. what is the age of each child?

Acar travels 85 kilometers per hour. what is the equivalent speed in meters per hour?

The length of time for one individual to be erved at a cafeteria is a random variable having an ex- ponential distribution with a mean of 4 minutes. what is the probability that a person will be served in less than/3 minutes on at least 4 of the next 6 days?