Decide whether the equation is or is not an identity.cos (A + ?) = cos A
A. Not an identity
B. Identity
Answer: A
Mathematics
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Solve the problem.Two points A and B are on opposite sides of a building. A surveyor chooses a third point C 79 yd from B and 98 yd from A, with angle ACB measuring 59.3°. How far apart are A and B (to the nearest yard)?
A. 89 yd B. 107 yd C. 116 yd D. 98 yd
Mathematics
Solve the problem.An airplane is cruising at an altitude of 15,840 feet. What is the plane's altitude in miles?
A. 6 mi B. 2 mi C. 3 mi D. 4 mi
Mathematics
Answer the question.What is the domain of the greatest integer function, given by f(x) = [[x]]?
A. {. . . , -2, -1, 0, 1, 2, . . . } B. (-?, ?) C. { 0, 1, 2, . . . } D. [0, ?)
Mathematics
Solve the formula for the specified variable.2x + 
= 
for z
A. z = 
B. z = 
C. z = 
D. z = 
Mathematics