You flip a coin. Then you pick a marble out of a bag of 4 reds and 3 blues. Then roll a six sided dice.
What is the probability that you get a heads, pick a blue
marble and then roll an odd number?

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

X+y=-4 x-y=2 use elimination with adding and subtraction

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?