Perform the indicated operation.-2 + (-6)
A. -8
B. -4
C. 8
D. 4
Answer: A
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Answer the question.Which of the following describes a study in which the participants naturally form groups by choice?
A. Observational study B. Double-blind experiment C. Single-blind experiment D. Case-control study
Solve the given applied problems involving variation.The pitch P of a musical tone varies inversely as its wavelength W. One tone has a pitch of 479 vibrations per second and a wavelength of 8.8 ft. Find the wavelength of another tone that has a pitch of 492 vibrations per second.
A. 0.000037 ft B. 0.12 ft C. 26,780.5 ft D. 8.6 ft
Solve the following equations for x and y:
2x - 2y = 10; 3x + y = 7 a. x = -2 y = 2 b. x = 2 y = -3 c. x = -3 y = 3 d. x = 3 y = 2 e. x = 3 y = -2
Find the weighted mean. Round to the nearest tenth.
A. 231.3 B. 83.8 C. 261.7 D. 292.5