Solve the problem.The area A of a rectangle is 
If the width W of the rectangle is 3z + 4, find the length L of the rectangle.
A. 5z + 2
B. 5z - 2
C. 15z - 2 - 
D. 5z - 2 + 
Answer: B
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Solve the problem.Your electrical bill states that you used 770 kilowatt-hours of energy in January. Determine your total electrical energy use, in joules.
A. 277,200,000 joules B. 2,772,000,000 joules C. 246,400,000 joules D. 2,464,000,000 joules
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 the system by using Gaussian elimination with backward substitution or by reducing the matrix to reduced-row echelon form.4x + 4y + z = 154x - 5y - z = -14x + y + 3z = 7
A. No solution B. (-1, 2, 2) C. (2, 2, -1) D. (2, -1, 2)
Determine whether the given events are mutually exclusive.Wearing a coat and wearing a sweater
A. No B. Yes