PLease help me with my math homework

Which statement best describes a square? a. a special rectangle that has four right angles b. a special trapezoid that has four sides of equal length c. a special rectangle that has four sides of equal length d. a special trapezoid that has four right angles

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

Two numbers have a sum of -19. one number is x. what expression represents the other number?