Hey y’all I need help

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

If sin(x) = 0 and cos(x) = 1, what is tan(x)?

At the beginning of the year, adrian's savings account balance was \$28$28. each week, he deposits another \$15$15 into that account, and he doesn't spend any of his savings. is his savings account balance proportional to the number of weeks since the start of the year?