There is a bag with only red marbles and blue marbles. The probability of randomly choosing a blue marble is 1 12 . There are 84 marbles in total in the bag and each is equally likely to be chosen. Work out how many red marbles there must be.

The pressure exerted on the walls of a container by a gas enclosed within it is directly proportional to the temperature of the gas. if the pressure is 6 pounds per square inch when the temperature is find the pressure exerted when the temperature of the gas is 380 degrees f show work for the

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

Atorch and a battery cost 2.50 altogether.the torch costs 1.50 more than the battery.what fraction of the total price is the torch? give your answer in its simplest form.