Evaluate the expression for = −3 and = 5. r^{-4} s^2

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

Hi, can anyone show me how to do this problem? 100 points for this. in advance

Will mark determine whether the conjecture is true or false. give a counterexample for any false conjecture. given: points r, s, and t conjecture: r, s, and t are coplanar. a) false; the points do not have to be in a straight line. b) true c) false; the points to not have to form right angles. d) false; one point may not be between the other two.