Identify the equation as either an identity or not.cos 2? = sin 2? tan ?
A. Identity
B. Not an identity
Answer: B
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Solve the problem.The following table shows the July electric bill of selected homes in Cincinnati along with the number of rooms in each home. 
Find the equation of the line of best fit for the number of rooms and the electric bills, and use it to predict the bill for a home with 11 rooms.
A. y = 11.8x + 43; $168 B. y = 12.1x + 44; $177 C. y = 12.1x + 47; $163 D. y = 10.2x + 51; $178
Find the unknown value in the percent proportion 
Round to the nearest tenth, if necessary.whole = 110, percent = 20
A. part = 11 B. part = 18.2 C. part = 22 D. part = 55
Solve the system of equations.-0.2x + 0.3y - 0.2z = 1.6-0.4x - 0.3y + 0.2z = 0.80.2x - 0.4y + 0.3z = -1.9
A. (0.6, 4, 0) B. (0.8, 2, 0) C. (0.6, 2, -1) D. (-4, 2, -1)
Find the indicated vector.Let u = 
. Find 9u.
A. 
B. 
C. 
D. 