Find the exact value of the trigonometric expression without the use of a calculator.If sin ? = 
, 0 < ? < 
and cos ? = 
, 0 < ? < 
, find the exact value of cos (? + ?).
A. 
B. - 
C. - 
D. 
Answer: B
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Solve the problem.Brand X copier has improved its copier so that it produces 19% more copies than its old model. If the old model ran 681 copies per hour, how many copies would the new model run? Round your answer to the nearest whole number.
A. 376 copies per hour B. 696 copies per hour C. 810 copies per hour D. 795 copies per hour
Multiply. Express the product in lowest terms.
? 
A. 
B. 14z
C. 
D. 
Solve the problem.The path of a projectile fired at an inclination ? (in degrees) to the horizontal with an initial speed v0 is a parabola. The maximum height H of the projectile is given by H = 
(1 - cos (2?))where g is the acceleration due to gravity.Show that the maximum height H can be written H = 
What will be an ideal response?
Write an algebraic expression, using x as the variable.A number plus 8
A. 8 B. 8x C. 8 - x D. 8 + x