What is the common ratio for this sequence: 4, -16, 64, -256, ... A. R = - 2

B. R = - 4

C. R = 2

D. R = 4

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%.

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).