What is the length of ab?

a. 18
b. 12
c. 3
d. 9

Tell whatever the ordered pair is a solution of the given system.

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6