What is the diameter of this circle if the circumference is 30 x inches?
C= 30 x in.

A. 15 in.
B. 30 in
C. 45 in.
D. 60 in.

The table represents a function. what is f(-2)? a.-3 b. -1 c.1 d.3

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.

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?