Fourty liters of a 40% acid solution is obtained by mixing a 28% solution with a 50% solution.Write a system of equations in which one equation represents the amount of final mixture required and the other represents the percent of acid in the final mixture. Let x and y represent the amounts of the 28% and 50% solutions, respectively.
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A. ?
B. ?
C. 
D. ?
E. ?
Answer: C
Mathematics
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Simplify the expression. Assume all variables represent positive real numbers.
+ 
- 
A. 
B. 
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D. 
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Provide an appropriate response.The graph of an exponential function with base a is given. Sketch the graph of g(x) = ax + 2. Give the domain and range of g. f(x) = ax 
What will be an ideal response?
Mathematics
Graph the circle.x2 + y2 + 12x + 2y + 21 = 0
A. 
B. 
C. 
D. 
Mathematics
Solve.
= 7.8
A. {6084} B. {-7.8} C. {7.8, -7.8} D. {7.8}
Mathematics