Four times the difference of a number

The square root of 5x equals 10

2.45 + = 3 What do I add to get to three. Is it 15?

X=2y+7 x=y+4 with substitution

Find all of the polar coordinates for (6, 31 degrees)

Identify the two whole numbers between which the product lies 7*8/10

Select the correct answer. You want to buy an item that costs $100. Which of these is the most cost-effective choice for buying the item?

Find the area of a circle from the given diameter d = 14 meters

If I was paying 875. now I pay 955. how much more am I paying

A belt and a wallet cost $42, while seven belts and four wallets cost $213. A) how much do four belts and four wallets cost? B) how much do three belts cost?

Qasim and Alejandra both earn $15 an hour at their job. This week Alejandra worked three hours more than Qasim. If h represents the number of hours Qasim worked, and in total they earned $195, how many hours did each person work?