Solve.The gravitational attraction A between two masses varies inversely as the square of the distance between them. The force of attraction is 4 lb when the masses are 3 ft apart, what is the attraction when the masses are 6 ft apart?
A. 3 lb
B. 4 lb
C. 2 lb
D. 1 lb
Answer: D
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Find the slope-intercept form of the equation of a line parallel or perpendicular to the given line and passing through the given point.Parallel to y = - 
x - 10, through (-5, -4)
A. y = - 
x - 
B. y = 2x - 6
C. y = - 
x + 
D. y = 2x + 6
Solve the problem.If f(x, y) = (3000ey)/(1 + 
/2) represents the population density of a planar region on Earth, where x and y are measured in miles, find the number of people within the rectangle -7 ? x ? 7 and -2 ? y ? 0.
A. 6000(1 - e-2) ln 4 ? 11,399
B. 3000(1 - e-2) ln 
? 3902
C. 12,000(1 - e-2) ln 
? 15,606
D. 6000(1 - e-2) ln 
? 7803
Express the statement as an equation involving the indicated variables.The volume V of a sphere is 
times ? times the cube of the radius r.
A. V = 
?r
B. V = 
?r3
C. V = 
?r2
D. V = 
? 
Make the indicated conversion within units of time.Convert 7 days to minutes.
A. 10,080 minutes B. 604,800 minutes C. 25,200 minutes D. 168 minutes