Calcium 47 is used for scanning bones. If 53 grams of a 250 gram calcium 47 sample is left after 30 hours what is the half life?

It costs 4.25 for 1 pound of roast beef. how much will it cost to purchase 2.5 pounds of roast beef? round to nearest cent

The cash price of a television is $580.the hire-purchase price of the television is $865.the hire-purchase price is an initial deposit of n% of the cash price and 6 equal monthly payments of $120.find the value of n.

Write the rational number in lowest terms 99/-15