Help

A model for consumers' response to advertising is given by N(a) = 2400 + 700Ina with a > 1 is the amount spent on advertising (in thousands of dollars) and N(a) is the number of units sold. 1. How many units are sold when 1, 050 dollars is spent on advertising? (2pts) 2. How much should be spent on advertising if 4000 units are to be sold? (3pts)