If eighteen more than two times a number is negative ten, what is the number?

(40 points) i need some . an answer definition is appreciated as well.

Jessica is a custodian at oracle arena.she waxes 20 m2 of the floor in 3/5 of an hour. jessica waxes the floor at a constant rate.at this rate how many sqaures meters can she wax per hour

Which equation represents a proportional relationship that has a constant of proportionality equal to 1/5