Find the mean of the data set.
Use the following information to answer questions 2-10. 24 students in an engineering class were asked to record the number of hours spent in a lab during a week. The results are listed below.
3, 10, 21, 14, 8, 5, 1, 4, 13, 7, 9, 6, 11, 10, 6, 7, 12, 16, 1 , 7, 14, 1, 11, 8
8.54
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Identify the conic section as a circle, parabola, ellipse, or hyperbola.
A. Hyperbola B. Parabola C. Circle D. Ellipse
Solve the problem.The hydrogen ion concentration of a substance
is about 2.9 x 10-12 moles per liter. Find the pH. Round to the nearest tenth. Use the formula pH = -log [H+].
A. -12.5 B. 12.5 C. 11.5 D. 11.8
Find the exact value of the expression.cos 
cos 
- sin 
sin 
A. 0
B. 1
C. -1
D. 
Let x be a number. Translate the English phrase or sentence into a mathematical expression. -44 decreased by a number
A. -44 - x B. -44 ÷ x C. x - (-44) D. -44 + x