The company president sets a goal that the percentage of working phones must increase from 30% to at least 80% by the end of the day. which inequality models this situation

Idon't get undoing if its pass adding and subtracting so can someone ? x-2 over 5 = 18

If (-3, y) lies on the graph of y = 3^x, then y =

Mandy and four of her friends want to see a movie. if m represents the cost for one person to see a movie, which expression represents the cost for mandy and her friends to see a movie?