Amy can mop the store in 30 minutes. james can mop the store in 45 minutes. how long would it take them if they worked together?

An assembly consists of two mechanical components. suppose that the probabilities that the first and second components meet specifications are 0.87 and 0.84. assume that the components are independent. determine the probability mass function of the number of components in the assembly that meet specifications. x

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

What is the greatest number of parts of a circle that can be formed by cutting the circle with 7 straight cuts? (note: the parts do not have to be equal in size)