Ten times the square of a non-zero number is equal to sixty times the number. what is the number?

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?

W-16=-12 solve each one step equation plz

The function show two sisters' savings account and the rate at which they plan to deposit money