Use a half-angle formula to find the exact value of the expression.sin 
A. - 
B. 
C. - 
D. 
Answer: D
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Solve.Approximately 5 × 103 employees of a certain company average $30,000 each year in salary. What is the total amount earned by all the employees of this company per year? Write your answer in scientific notation.
A. $15 × 109 B. $15 × 108 C. $1.5 × 108 D. $1.5 × 109
The life expectancy E, in solar lifetimes, of a star is related to the mass M, in solar masses, by the formula
.
?
A: Make a graph of the life expectancy versus the mass. Include up to 20 solar masses.B: Does a larger star have a longer or shorter life expectancy?C: If one star is double the mass of another, how do their life expectancies compare? Express your answer as a percent.
?
Round your answer to two decimal places if necessary.
?
What will be an ideal response?
The loudness L(x), measured in decibels, of a sound of intensity x, measured in watts per square meter, is defined as 
watt per square meter is the least intense sound that a human ear can detect. Determine the loudness, in decibels, of the sound.A particular Boeing 747 jetliner produces noise at a loudness level of 113 decibels. Find the intensity level (round to the nearest hundredth) in watt per square meter for this noise.
A. 0.40 watt per square meter B. 0.10 watt per square meter C. 0.20 watt per square meter D. 0.80 watt per square meter
Write an equation. Then, solve and check.The population of a city is 
It is estimated that this is about 
of the projected population fifty years later. What is the projected population of the city?
A. 4 = 
x; x = 6 million people
B. 4 = 
x; x = 2
million people
C. 4 = x - 
; x = 4
million people
D. x = 
? 4; x = 2
million people