Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Use inductive reasoning to predict the next equation.(4 × 1) x (2 × 1) = 8(4 × 10) x (2 × 2) = 160(4 × 100) x (2 × 3) = 2400
A. (4 × 1000) x (2 × 4) = 36,000 B. (4 × 1000) x (2 × 4) = 3200 C. (4 × 1000) x (2 × 4) = 28,000 D. (4 × 1000) x (2 × 4) = 32,000
Mathematics
Determine whether the ordered pair is a solution for the equation.
; y = 
x + 
A. Yes B. No
Mathematics
A man is running around a circular track that is 200 m in circumference. An observer uses a stopwatch to record the runner’s time at the end of each lap, obtaining the data in the following table.
What was the man’s average speed (rate) between 108 s and 203 s? Round the answer to two decimal places.
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Mathematics
Determine whether the equation defines y as a function of x.xy = -2
A. Yes B. No
Mathematics