Subtract.(-2r4 + 9r3 - 3r) - (8r4 - 9r3 + 6r2 - 2r)
A. -6r4 - 6r2 + r
B. -10r4 + 18r3 - 6r2 - r
C. 10r4 - 18r3 + 6r2 + r
D. 6r4 + 6r2 - r
Answer: B
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Find the least common multiple (LCM) of the pair of numbers.14 and 7
A. 7 B. 98 C. 686 D. 14
Solve the problem.In 1838, the German mathematician and astronomer Friedrich Wilhelm Bessel was the first person to calculate the distance to a star other than the Sun. He accomplished this by first determining the parallax of the star, 61 Cygni, at 0.314 arc seconds (Parallax is the change in position of the star measured against background stars as Earth orbits the Sun. See illustration.) If the distance from Earth to the Sun is about 150,000,000 km and ? = 0.314 seconds = 
minutes = 
degrees, determine the distance d from Earth to 61 Cygni using Bessel's figures. Express
the answer in scientific notation. 
A. 1.05 × 1014 km
B. 1.97 × 1014 km
C. 2.28 × 1013 km
D. 9.85 × 1013 km
Solve.Subtract 5 from 63.
A. 68 B. 59 C. 58 D. 57
Give the coordinates of the labeled points.
A. A(-1, 0); B(-1, -2) B. A(-1, 1); B(1, -2) C. A(1, 0); B(1, -2) D. A(-1, 0); B(1, -2)