There is a bag with only red marbles and blue marbles. The probability of randomly choosing a red marble is 7 8 . There are 72 marbles in total in the bag and each is equally likely to be chosen. Work out how many red marbles there must be.

A) if $50000 is invested in a bank account that pays 9.3% of interest compounded on a six-monthly basis, how much money will be in the account after 3 and 12 years? b) if matusalen's father had put $2.0 in the bank when he was born and there, how long would matusalen have had to his death (969 years later) if the interest was 7% per year composed each month and weekly?

Find the slope of the line passing through a pair of points

Which of the following can be used to explain a statement in a geometric proof?