Chris is standing on a cliff that is 3 feet above sea level. he dives into the water and descends to a depth 10 feet below the surface of the sea. on a number line, what is the distance between the two elevations?

Asalesperson set a goal to earn $2,500 in august. she receives a base salary of $1,000 per month as well as a 20% commission for all sales in that month. how many dollars of merchandise will she have to sell to meet her goal?