Which of the following options represents an equation that can be used to solve for the missing side of a right triangle? select all that apply.

a. a^2 + b^2 = c
b. b^2 - c^2 = a^2
c. c^2 = a^2 = b^2
d. c = a + b

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.

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

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11