Using a sum or difference identity, write the following as an expression involving functions of x.sin (x + 45°)
A. sin x
B. -cos x
C. 
cos x - 
sin x
D. 
cos x + 
sin x
Answer: D
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Convert the units using unit fractions.4 c = 
fl oz
A. 8 B. 32 C. 64 D. 16
Solve the problem.Two sound waves, producing the pressures src="https://sciemce.com/media/4/ppg__rrr0629191325__f1q25g6.jpg" alt="" style="vertical-align: -4.0px;" />Round k to the nearest ten-thousandth, if necessary.
A. a = 5; k = 808.6467
B. a = 2.2; k = 0.9273
C. a = 2.2; k = 808.6467
D. a = 5; k = 0.6435
and 
combine on a person's ear drum to produce the pressure 
Graph P in 
by 
and use the graph to estimate values for a and k so that
Graph using the slope and the y-intercept.y = -3x - 6
A. 
B. 
C. 
D. 
Solve the problem.A 15-foot ladder is leaning against a house with the base of the ladder 5 feet from the house. How high up the house does the ladder reach? Round to the nearest tenth foot.
A. 14.3 ft B. 10 ft C. 15.8 ft D. 14.1 ft