Use the pH scale to answer the question.What is the hydrogen ion concentration of a solution with pH 1.5?
A. 3.2 x 10-1
B. 3.2 x 10-4
C. 3.2 x 10-3
D. 3.2 x 10-2
Answer: D
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Find the exact value of the expression.
A. - 
B. - 
C. -
D. -2
Expand, where i2 = -1.(1 + i)8
A. 
B. -64
C. 16
D. 
Joe and Bryan have been comparing their investment portfolios for several years. Joe claims that his portfolio of only stocks has a better record than Bryan's portfolio that is 20% stocks and 80% bonds. Let x be a random variable representing the annual percent return for Joe's portfolio and let y be a random variable representing the annual return on Bryan's portfolio. Use this information to calculate the coefficient of variation for Bryan's portfolio. Round your answer to two decimal places.
a. 75.8%
b. 131.92%
c. 65.31%
d. 125.15%
e. 153.11%
Identify the equation without applying a rotation of axes.2x2 - 12xy + 4y2 - 4x - 3y - 3 = 0
A. hyperbola B. parabola C. ellipse D. not a conic