Suppose that we have two tanks ( A and B ) between which a mixture of brine flows. Tank A contains 200 liters of water in which 20 kilograms of salt has been dissolved and Tank B contains 200 liters of water in which 10 kilograms of salt has been dissolved. Fresh water is pumped into Tank A at the rate of 200 liters per hour, and brine is pumped into Tank B from Tank A at the rate of 200 liters per hour. Brine is also drained at a rate 200 liters of brine per hour from Tank B . All brine mixtures are well-stirred. Find the amount of salt in each tank at time t .

Ascientist places 24 cells in a petri dish. she knows the cells grow at an exponential rate, doubling in number every hour. how long will it take (in hours) for there to be 1100 cells in the dish? time to 1100 cells: 5.51832530 hours how long will it take to reach 110 cells? time to 110 cells : 2.1963972 hours what is the average rate of change in the number of cells between 9 hours and 11 hours? average rate of change: cells per hour what is the instantaneous rate of change after 7 hours? instantaneous rate of change: cells per hour note: you can earn partial credit on this problem.

Heather is a cashier. she can ring up 1212 customers in 99 minutes. at this rate, how many minutes does it take her to ring up 44 customers?

Does the construction demonstrate how to copy an angle correctly using technology a) yes the distance between points a and f was used to create circle h b) yes the distance between points f and g was used to create circle h c) no the distance between points a and f was used to create circle h d) no the distance between points f and g was used to create circle h