Find the circumference of the circle. Calculate the exact and approximate value to two decimal places.
A. ? m; 24.12 m
B. 1.6? m; 5.02 m
C. 3.2? m; 10.05 m
D. 6.4? m; 20.1 m
Answer: D
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Solve the system by the elimination method or a combination of the elimination and substitution methods.x2 + 3xy + y2 = 4 x2 - 3xy - y2 = 4
A. {(2, 0), (-2, 0), (2, -6), (-2, 6)} B. {(2, -6), (-2, 6)} C. {(0, 2), (0, -2), (2, -6), (-2, 6)} D. {(2, 0), (-2, 0)}
Divide. Simplify, if possible.10.45 ÷ (1.9)
A. 85.5
B. 8.55
C. 5.5
D. 
Use the inverse of the coefficient matrix to solve the system of equations. y + z = 5,3x -z = 8, 2x + y + 3z = 9; A-1 = - 
A. 
B. 
C. 
D. 
Solve the problem.Use the formula M = log (I/I0), where the magnitude of an earthquake on the Richter scale is based on I, the measurement of a seismic wave, and I0, the measurement of a seismic wave of a level zero earthquake with the same epicenter. An earthquake was recorded as 107.5 times more powerful than a reference level zero earthquake. What was the magnitude of this earthquake on the Richter scale? Round to the nearest tenth.
A. 2.5 B. 7.5 C. 17.5 D. 17.3