Solve the problem.At a plant that packages bottled spring water, the water is passed through a sequence of ion-exchange filters to reduce the sodium content prior to bottling. Each filter removes 65% of the sodium present in the water passing through it. Determine the number of filters that must be used to reduce the sodium concentration from 21 parts-per-million to 0.43 parts-per-million.
A. 11 filters
B. 12 filters
C. 9 filters
D. 10 filters
Answer: C
You might also like to view...
Decide whether the argument is an example of inductive or deductive reasoning.Fresh fruit costs more in winter. This is January. These fresh strawberries cost more.
A. Inductive B. Deductive
Provide an appropriate response.Eight voters are asked to rank 4 brands of ice cream: A, B, C, and D. The eight voters turn in the following ballots showing their preferences in order:BCADBCADCADBCDABCDABBACDCDABCADBMake a preference table for these ballots.
A. 
B. 
C. 
D. 
Find the general term of the arithmetic sequence then find the indicated term of the sequence. Assume that the domain of the sequence is all natural numbers.Find an and a8.
A. an = n + 1; a8 = 9 B. an = n - 2; a8 = 6 C. an = n + 2; a8 = 10 D. an = n - 1; a8 = 7
Give the mathematical formulation of the linear programming problem. Graph the feasible region described by the constraints and find the corner points. Do not attempt to solve.Suppose an horse feed to be mixed from soybean meal and oats must contain at least 200 lb of protein and 40 lb of fat. Each sack of soybean meal costs $20 and contains 60 lb of protein and 10 lb of fat. Each sack of oats costs $10 and contains 20 lb of protein and 5 lb of fat. How many sacks of each should be used to satisfy the minimum requirements at minimum cost?
What will be an ideal response?