Consider the graph of the line of best fit, y = 0.5x + 1, and the given data points.

which is the residual value when x = 2?

a.–2

b.–1

c.1

d.2

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?