Alarge tank contains 200 liters of a salt solution which has a concentration of 0.4 kilograms per liter. a salt solution which has a concentration of 0.55 kilograms per liter is added to the solution at a rate of 50 liters per minute. at the same time, the solution drains from the tank at 50 liters per minute.

find the amount s of the salt in the solution as a function of t:
s = kilograms.

step-by-step explanation:

de-gf

hj=3x+20

ji=15x-64

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

answer: 94

step-by-step explanation: 79+91+92+94+94 = 450 divided by 5 (since there are 5 number that are being added) = 90

she will sew have sewn five dresses   and be 1/3 done with the sixth one in an hour.

step-by-step explanation:

3/4 of an hour=45 mins

lucy makes 1 dress per 11.25 minutes

45 mins+11.25 mins=56.25 mins

60 mins- 56.25 mins=3.75 mins

3.75 mins is 1/3 of of 11.25 mins

therefore she the other 1/3 would be part of the hour and she will have sewn 5 dresses and begun the sixth.

contact me if you have any questions you are welcome.