-7x - 2y = -13
x = 2y + 11

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

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?

240 seventh graders and two-thirds of the students participate in after-school activities how many students participate in after-school activities