Find the exact value of the expression using a sum or difference identity.sin (
)
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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Solve the variation problem.The amount of time it takes a swimmer to swim a race is inversely proportional to the average speed of the swimmer. A swimmer finishes a race in 30 seconds with an average speed of 5 feet per second. Find the average speed of the swimmer if it takes 37.5 seconds to finish the race.
A. 3 feet per second B. 6 feet per second C. 5 feet per second D. 4 feet per second
Mathematics
Evaluate f(x) at the given value of x.f(x) = x2 + 3; x = 9
A. 86 B. 81 C. 80 D. 84
Mathematics
Perform the operation by applying the standard order of operations for a series of calculations.12 × 8 + 19 × 10
A. 2376 B. 286 C. 3240 D. 1150
Mathematics
Describe the shape of the given histogram.
A. Left skewed B. Uniform C. Right skewed D. Normal
Mathematics