un comerciante compro 15 calculadoras a 40 dolares cada una .vendio 5 de ellas ,a precio de promoción por 100 dolares .calcula el precio de las restantes para que gane 150 dolares en la operación necesito saber que debo hacer no la respuesta

2-digit numbers less than 91 which are 1 less than a multiple of 10

Fred has a total of 62 dvd and cd. if the number of cd is three more than two times the number of dvd, how many cd does he have?

Find the equation of the line that goes through the points (4, –1) and (2, –5). use slope formula,equation,to find the slope of a line that passes through the points. m = use slope-intercept form, y = mx + b, to find the y-intercept (b) of the line. b = write the equation in slope-intercept form, y = mx + b.