PLEASE HELP MIDDLE SCHOOL MATH. There are 18 black and 12 navy socks in your drawer . The room is dark and you can turn on the light. What is the least number of socks you have to take out of your drawer to be certain that you have a pair of black socks?

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?

Use the distributive property -7(-2x+u-2)

What are the domain and range of f(x)= -log5(x+2)