Identify the equation as either an identity or not.(sin x + cos x)2 = 1
A. Identity
B. Not an identity
Answer: B
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Find the indicated matrix.Let C = 
and D = 
. Find C - 2D.
A. 
B. 
C. 
D. 
Fill in the blank with one of the choices listed below. Some choices may be used more than once. 
The 
of a set of numbers in numerical order is the middle number. If there are an even number of numbers, the median is the 
of the two middle numbers.
A. mean; median B. mean; mode C. median; mean D. median; mode
Express the exercise as a system of linear equations, then find the solution. Use a calculator where appropriate.Dmitri needs 8 liters of a 59% solution of sulfuric acid for a research project in molecular biology. He has two supplies of sulfuric acid solution: one is an unlimited supply of the 56% solution and the other an unlimited supply of the 64% solution. How many liters of each solution should Dmitri use?
A. 56% solution: 5 liters; 64% solution: 3 liters B. 56% solution: 3 liters; 64% solution: 5 liters C. 56% solution: 4.5 liters; 64% solution: 3.5 liters D. 56% solution: 5.5 liters; 64% solution: 2.5 liters
Give the degree measure of ?.? = cos-1 
A. 30° B. 330° C. 45° D. 315°