Identify the equation as either an identity or not.cos2x + cos2y = cos (x + y) cos (x - y)
A. Not an identity
B. Identity
Answer: A
Mathematics
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Find the product.(9m + 10)2
A. 81m2 + 180m + 100 B. 9m2 + 180m + 100 C. 81m2 + 100 D. 9m2 + 100
Mathematics
Perform the indicated operation. Simplify the result.
- 
A. 
B. 
C. 
D. 
Mathematics
Solve the variation problem.The intensity I of light varies inversely as the square of the distance D from the source. If the intensity of illumination on a screen 5 feet from a light is 4 foot candles, find the intensity on a screen 20 ft from the light.
A. 2 foot-candles
B. 1
foot-candles
C. 
foot-candles
D. 
foot-candles
Mathematics
Solve the formula for the indicated variable.r = 
for S
A. S = 4?r
B. S = 16?2r2
C. S = 4?r2
D. S = 
Mathematics