Find a and b.If 1 < x < 7, then a < 3x + 7 < b.
A. a = -4, b = 14
B. a = 8, b = 14
C. a = 10, b = 28
D. a = 11, b = 17
Answer: C
Mathematics
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Solve the problem.The position of an object moving in a straight line is given by s = 2t2 - 3t, where s is in meters and t is the time in seconds the object has been in motion. How long (to the nearest tenth) will it take the object to move 7 meters?
A. 8.0 sec B. 2.6 sec C. 2.8 sec D. 7.7 sec
Mathematics
Multiply and simplify. Assume that all variables in a radicand represent positive real numbers.
? 
A. xy
B. 3x2y2
C. 3xy2
D. 3xy
Mathematics
Solve the equation by the square root property.x2 = -81
A. {±9i} B. {40.5} C. {9} D. {±9}
Mathematics
Provide an appropriate response.If a > 0, which of the following correctly describes - 
?
A. Zero B. Not real C. Positive D. Negative
Mathematics