Use the substitution method or the elimination method to solve the system. If the system has infinitely many solutions, express the ordered pair in terms of x or y.2x + 6y = 62x + 2y = 18
A. ( -12, 2)
B. (12, -3)
C. (-3, 12)
D. (-12, 6)
Answer: B
Mathematics
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Graph the parabola or ellipse. Include the directrix that corresponds to the focus at the origin.r = 
A. 
B. 
C. 
D. 
Mathematics
Evaluate the integral.
A. 108 B. 12 C. 72 D. 36
Mathematics
Express the number in decimal notation.7 × 10-7
A. 0.0000007 B. -700,000 C. 0.00000007 D. 0.000007
Mathematics
Solve the problem.A surveyor standing 70 meters from the base of a building measures the angle to the top of the building and finds it to be 35°. The surveyor then measures the angle to the top of the radio tower on the building and finds that it is 50°. How tall is the radio tower?
A. 13.47 m B. 12.35 m C. 34.41 m D. 18.76 m
Mathematics