If Jan can buy 12 copies of a certain book $40, what is the unit rate for cost per copy? How much would it cost her to buy 18 copies at the same rate?

The lengths of two sides of a right triangle are given. find the length of the third side. round to the nearest tenth if necessary. a) y = 12/5x + 39/5 b) y = 5/12x + 5/39 c) y = 12/5x - 39/5 d) y = 5/12x - 5/39

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year. the population of her town is changing by a constant rate.true or false?