Without graphing the function, determine its amplitude or period as requested.y = cos 3xFind the period.
A. 2?
B. 1
C. 
D. 3
Answer: C
Mathematics
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Solve the equation.
= 8
A. 509 B. -1 C. 515 D. 125
Mathematics
Graph.x2 + 25y2 = 25
A. 
B. 
C. 
D. 
Mathematics
Translate to a proportion and solve. When necessary, round to the nearest hundredth.What is 89% of 243?
A. 21.63 B. 2162.7 C. 21,627 D. 216.27
Mathematics
Solve the problem.Use the formula d = 10 log (I/I0), where the loudness of a sound in decibels is determined by I, the number of watt/m2 produced by the soundwave, and 
watt/m2. A certain noise produces 5.92 × 10-4 watt/m2 of power. What is the decibel level of this noise? Round to the nearest decibel.
A. 202 decibels B. 9 decibels C. 78 decibels D. 88 decibels
Mathematics