Solve the problem using two linear equations in two variables and Cramer's rule.A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 3% cement should he mix with 3 bags of 45% cement to produce a mix containing 10% cement?
A. 17 bags
B. 18 bags
C. 23 bags
D. 15 bags
Answer: D
Mathematics
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Solve the problem.Find the vector from the origin to the center of mass of a thin triangular plate (uniform density) whose vertices are A(10, 4, 2), B(7, 9, 5), and C(2, 8, 10).
A. 
i + 7j + 
k
B. 
i - 
j - 8k
C. 
i - 1j - 
k
D. 
i - 
j - 
k
Mathematics
Which of the following is not part of the process of making a parallelogram? ?
A. ?Using a straightedge and a compass. B. ?Measuring length of lines. C. ?Finding the intersection of two arcs. D. ?Using a straightedge to measure the length of a line. E. ?None of the above.
Mathematics
Graph the system of inequalities.y > 3x ? 1
A. 
B. 
C. 
D. 
Mathematics
Find the present value. Round to the nearest cent.
A. $23,775.16 B. $10,809.03 C. $10,767.52 D. $5,232.48
Mathematics