Determine whether the expression represents a number that is positive, negative, or zero.(-7)-9
A. Negative
B. Zero
C. Positive
Answer: A
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Use the guidelines to evaluate the study. From the information given, what is the biggest flaw in the study?An educational researcher wishes to compare the effectiveness of two different math textbooks. She has the tenth graders at one school use the first book for one year and the tenth graders at another school use the second textbook for one year. At the end of the year, she gives the same math test to both classes and compares the results.
A. Participation bias B. Selection bias C. Confounding variables D. The source E. The setting
Solve the problem.A tower is 540 feet high. If a coin were dropped from the top of the tower, how high would the coin be from the ground after 4 seconds?
A. 294 ft. B. 276 ft. C. 298 ft. D. 284 ft.
Simplify.
A. 15 B. does not exist as a real number C. 16 D. 112
Add or subtract. Express the answer as a mixed number.11
- 3
A. 7
B. 13
C. 7
D. 14