What is the mean absolute deviation of these data?

What expression is equivalent to 42x-56y

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

The value, v, of kalani’s stock investments over a time period, x, can be determined using the equation v=750(0.80)^-x. what is the rate of increase or decrease associated with this account? 20% decrease 20% increase 25% decrease 25% increase