A20$ bill, two 10$ bills, three $5 bills and four $1 bills are placed in a bag. if a bill is chosen at random, what is the expected value for the amount chosen?

How do i do this using elimination 2x+3y=12 x-y=6

Can someone answer this question? : )

It is saturday morning and jeremy has discovered he has a leak coming from the water heater in his attic. since plumbers charge extra to come out on the weekends, jeremy is planning to use buckets to catch the dripping water. he places a bucket under the drip and steps outside to walk the dog. in half an hour the bucket is 1/5 of the way full. what is the rate at which the water is leaking per hour?