(6 points) a tank contains 40 liters of water in which 2.5 kg of salt is dissolved. a brine solution containing 2 kg of salt per liter of water is pumped into the tank at the t liters per minute, and the well-stirred mixture is pumped out at represent the amount of salt in the tank at time t. write the corresponding first order initial value problem. (do not solvel) ate of s ern

An annual marathon covers a route that has a distance of approximately 26 miles. winning times for this marathon are all over 2 hours. the following data are the minutes over 2 hours for the winning male runners over two periods of 20 years each. earlier period 14 12 15 22 13 10 19 13 9 14 20 18 16 20 23 12 18 17 6 13 recent period 7 11 7 14 8 9 11 14 8 7 9 8 7 9 9 9 9 8 10 8 (a) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the earlier period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks. for more details, view how to split a stem.) minutes beyond 2 hours earlier period 0 1 2 (b) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the recent period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks.) minutes beyond 2 hours recent period (c) compare the two distributions. how many times under 15 minutes are in each distribution

Divide. –40 ÷ –5 a –8 b 200 c -200 d 8

Asequence is a function whose is the set of natural numbers