Identify whether the equation is a linear equation in two variables. Answer "is" or "is not."9y = x
A. is
B. is not
Answer: A
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Express the sum or difference as a product of sines and/or cosines.cos(4?) + cos(2?)
A. 2 sin(3?) sin ? B. 2 cos(3?) cos ? C. 2 cos(3?) sin ? D. 2 cos(3?)
Solve the problem.The maximum distance d in kilometers that you can see from a height h in meters is given by the formula 
How high above the ground must you be to see 55 kilometers. (Round to the nearest tenth of a meter.)
A. 246.9 m B. 864.3 m C. 15.7 m D. 26 m
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. 
Solve the problem. Round dollars to the nearest cent and rates to the nearest tenth of a percent.Toys4U purchases tricycles for $26. The store's operating expenses are 20% of cost with a net profit of 11% of cost. Find the selling price of one tricycle.
A. $28.34 B. $17.94 C. $23.66 D. $34.06