There are 40 nickels in every standard coin roll, what is the constant of proportionality?

What is the average diastolic blood pressure for adults

Write the expression as a single natural logarithm. 2 in a - 4 in y

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?