Solve the problem.The gravitational force (in lb) of attraction between two objects is given by 
where x is the distance between the objects. If the objects are 5 ft apart, find the work required to separate them until they are 150 ft apart. Express the result in terms of k.
A. 
k
B. 
k
C. 
k
D. 
k
Answer: B
Mathematics
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Solve the system by the substitution method. Be sure to check all proposed solutions.x + y = 6y = 2x
A. {(-2, 8)} B. {(2, 4)} C. {(3, 3)} D. {(1, 5)}
Mathematics
Solve the problem.Determine whether the ordered triple (2, 8, -3) is a solution of the system of equations.3x - 4y - 2z = -204x + y - z = 19 x - 2y + 3z = -23
A. Yes B. No
Mathematics
Evaluate the expression.
A. 72
B. 2!
C. 
D. 
Mathematics
Find the area of the triangle by using Heron's formula. Round the answer to the nearest tenth. All sides are measured in inches.a = 40, b = 58, c = 67
A. 1442.4 sq in. B. 1153.9 sq in. C. 127 sq in. D. 1730.9 sq in.
Mathematics