What are m21 and m_2?

For the equation below, x is the input and y is the output. y = -4x + 3 if the input is -8, then the output is

Using pert, adam munson was able to determine that the expected project completion time for the construction of a pleasure yacht is 21 months, and the project variance is 4. a) what is the probability that the project will be completed in 17 months? b) what is the probability that the project will be completed in 20 months? c) what is the probability that the project will be completed in 23 months? d) what is the probability that the project will be completed in 25 months? e) what is the due date that yields a 95% chance of completion?

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.