Simplify the expression.
?
?
Assume that denominator is not 0.
?
A. ?
B. ?
C. ?
D. ?
Answer: A
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Decide whether the statement is true or false.If two lines are perpendicular, then they form vertical angles at their intersection which are always acute.
A. True B. False
Solve the problem.According to relativity theory, an observer who measures the duration of an event, such as the decay of an unstable subatomic particle, will obtain a reading that is affected by any motion of the observer relative to the location of the event. The time, src="https://sciemce.com/media/4/ppg__text0427190932__f1q14g3.jpg" alt="" style="vertical-align: -4.0px;" /> compute 
measured by an observer moving at a speed of v relative to the location of the event will be larger than the time, ?to, measured by an observer who is not in relative motion. This phenomenon is described by the equation 
where c is the speed of light. If 
using the first four nonzero terms of the series expansion for 
A. 1.02058
B. 1.08062
C. 1.04062
D. 1.02062
Find all local extreme values of the given function and identify each as a local maximum, local minimum, or saddle point.
A. f
= - 36, local maximum
B. f
= 12, saddle point; f
= 12, saddle point
C. f
= 12, local minimum; f
= 12, local minimum
D. f
= 12, saddle point
Use a commutative property to complete the statement.yb =
A. by
B. -yb
C. b + y
D. 