Solve the problem.Given the approximation sin 40° ? 0.64, use trigonometric identities to find the approximate value of cos 
Round the answer to two decimal places.
A. 0.64
B. 0.84
C. 0.77
D. 1.31
Answer: C
Mathematics
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Solve the problem.When an object is dropped to the ground from a height of h meters, the time it takes for the object to reach the ground is given by the equation t = 
, where t is measured in seconds. If an object falls 122.5 meters before it hits the ground, find the time it took for the object to fall.
A. 5 sec B. 25 sec C. 6 sec D. 8 sec
Mathematics
Use the equality test for fractions to determine if the fractions are equal.
A. Yes B. No
Mathematics
Simplify the exponential expression.
A. 9x10 B. 9x9 C. x10 D. x9
Mathematics
Solve.log4 x2 = log4(2x + 15)
A. ? B. {-3} C. {5} D. {5, -3}
Mathematics