Julian makes and sells wallets. He estimates that his income can be modeled by y=18x−144 , where x is the number of wallets he sells. He estimates that his costs to make the wallets can be modeled by y=7x+164 . How many wallets does Julian need to make in order to break even?

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

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?

Determine if the outside temperature is a function of the time of day or if the time of day is a function of temperature and explain why or why not.