Factor completely by trial and error. If prime, so state.4a2 + 12a + 9
A. prime
B. (2a + 3)(2a + 3)
C. (2a - 3)(2a - 3)
D. (4a + 3)(a + 3)
Answer: B
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A solution contains 0.54 liters of sulfuric acid. If this represents 12% of the total amount, find the total amount.
A. 5 liters B. 0.5 liters C. 1.5 liters D. 7 liters E. 4.5 liters
Solve the problem.A chemist needs to mix a 20% acid solution with a 70% acid solution to obtain 8 liters of a 50% acid solution. How many liters of each of the solutions must be used?
A. 1.6 L of the 20% solution; 6.4 L of the 70% solution B. 2.4 L of the 20% solution; 5.6 L of the 70% solution C. 4 L of the 20% solution; 4 L of the 70% solution D. 3.2 L of the 20% solution; 4.8 L of the 70% solution
Represent the shaded area in the figure group with an improper fraction.
A. 
B. 
C. 
D. 2
To replace some damaged ductwork, 
linear feet of 
duct is needed. The cost is $ 
varid="variable_id_field" variablename="impvar_896a7c6135674ff999fb2a27c" class="wirisformula" /> per four linear feet. What is the cost of replacement? A. $176.00 B. $49.45 C. $44.00 D. $23.38 E. $82.82