Solve using a system of two equations in two unknowns.Dmitri needs 5 liters of a 7% solution of sulfuric acid for a research project in molecular biology. He has two unlimited supplies of sulfuric acid solution: 5% solution and 10% solution. How many liters of each solution should Dmitri use?
A. 5% solution: 3 L, 10% solution: 2 L
B. 5% solution: 3.5 L, 10% solution: 1.5 L
C. 5% solution: 2.5 L, 10% solution: 2.5 L
D. 5% solution: 2 L, 10% solution: 3 L
Answer: A
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Solve.The population of a small town in 1988 was 11,000 people. Due to decline in industrial growth the population has since been decreasing at a rate of 4% every year. What was the population of this town in 1998?
A. 5925 people B. 6586 people C. 7313 people D. 8112 people
Without solving, choose the correct solution by deciding which choice satisfies the given conditions.Zacharias has a total of 68 coins, all of which are either dimes or nickels. The total value of the coins is $5.90. Find the number of each type of coin.
A. 23 nickels; 45 dimes B. 18 nickels; 50 dimes C. 20 nickels; 48 dimes D. 50 nickels; 18 dimes
Write the series in summation notation. Use the index i and let i begin at 1 in each summation.
+ 
+ 
+ 
+ 
A. 
B. 
C. 
D. 
Identify the numbers from the given list that belong to the indicated set. 12, 
, -24, 0, 
, - 
, 9.9, 
Natural numbers
A. 12, 0
B. -24, 0, 12
C. 12, 
D. 12, 0, 