What is the solution set of -9x ≥ 27?

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?

2/3(-6y+9x) expand each expression using the distributive property

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry