3 Find the height of a pyramid whose volume is 20 cm and base area is 12 cm.
A 1.67 cm
B 5 cm
8 cm
10 cm

The table above shows approximate conversions from gallons to liters. what is the value of x?

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

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?