___a value used to represent a true measurement that is not exact when an exact answer is not possible

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%.

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

What value of x is in the solution set of 4x – 12 s 16 + 8x?