The diameter of the earth is 1.28 x 10^4 kilometers what is the volume of the earth. leave your answer in scientific notation

49xy +34y - 72z. determine the degree of the polynomial

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

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%.