Please help with this

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

Find the least common multiple of the expressions: 1. 3x^2, 6x - 18 2. 5x, 5x(x +2) 3. x^2 - 9, x + 3 4. x^2 - 3x - 10, x + 2 explain if possible