250 students in a math class take the final exam. The scores on the exam have an approximately normal distribution with mean ? = 75 and standard deviation ? = 10.Approximately what percent of the students scored between 65 and 75 points?
A. 95%
B. 10%
C. 68%
D. 34%
E. none of these
Answer: D
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Solve by completing the square to obtain exact solutions.10x2 + 27x + 18 = 0
A. 
, 
B. - 
, - 
C. - 
, - 
D. 
, 
Solve.The volume of wood in a tree varies jointly as the height of the tree and the square of the distance around the tree trunk. If the volume of wood is src="https://sciemce.com/media/4/ppg__10706192114__f1q57g5.jpg" alt="" style="vertical-align: -4.0px;" /> around the trunk?
A. 72.64 cubic feet
B. 80.64 cubic feet
C. 89.64 cubic feet
D. 84.64 cubic feet
when the height is 
and the distance around the trunk is 
what is the volume of wood obtained from a tree that is 
tall having a measurement of
Determine whether the pair of lines is parallel, perpendicular, or neither. 3x - 4y = 20 8x + 6y = 20
A. Parallel B. Perpendicular C. Neither
Find the inverse function of f.
A. 
B. 
C. 
D. 
E. 