Solve the problem.Martha can rake the leaves in her yard in 2 hours. Her younger brother can do the job in 6 hours. How long will it take them to do the job if they work together?
A. 
hr
B. 
hr
C. 6 hr
D. 3 hr
Answer: A
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Consider the normal distribution given below and assume that P is a point of inflection of the curve.
Find the third quartile Q3 of the distribution rounded to the nearest meter.
A. 115 m B. 149 m C. 150 m D. 104 m E. 58 m
Solve the problem.An airplane flying faster than the speed of sound creates sound waves that form a cone. If ? is the vertex angle of the cone and m is the Mach number for the speed of the plane, then 
Find the Mach number to the nearest tenth if 
A. 5 B. 3.9 C. 3.7 D. 4.5
Given the set sketched on the number line, identify the type of interval (open, closed, half-open, open infinite, closed infinite), write the set using set-builder notation, and write the set using interval notation.
A. closed interval; {x|-3 ? x ? 2}; [-3, 2] B. half-open interval; {x|-3 ? x < 2}; [-3, 2) C. open interval; {x| -3 < x < 2}; (-3, 2) D. half-open interval; {x|-3 < x ? 2}; (-3, 2]
Find the center and radius of the circle.(x - 1)2 + y2 = 49
A. (-1, 0); 49 B. (0, 1); 49 C. (1, 0); 7 D. (0, -1); 7