For the period 1971 − 2001, the number y of films produced in the world can be modeled by the function y = 10x2 − 94x + 3900 where x is the number of years since 1971. in what year were 4200 films produced?

Can any one me with the answers to these questions asap?

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists

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?