Alexander is going to invest in an account paying an interest rate of 2.4% compounded continuously. How much would Alexander need to invest, to the nearest hundred dollars, for the value of the account to reach $710 in 19 years?

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?

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?