For a project, you need to make three triangles out of cardboard. each triangle has a height of 5 inches and a base of 10 inches. which equation can you use to solve for the total amount of cardboard you will need?

Consider u = {x|x is a negative real number}which is an empty set? o {x|x eu and x has a negative cube root}o {x|x eu and x has a negative square root}{x|x eu and x is equal to the product of a positive number and -1}{x|x eu and x is equal to the sum of one negative and one positive number?