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%
b. 131.92%
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Solve the problem.In the formula N = Iekt, N is the number of items in terms of an initial population I at a given time t and k is a growth constant equal to the percent of growth per unit time. There are currently 51 million cars in a certain country, increasing by 5% annually. How many years will it take for this country to have 62 million cars? Round to the nearest year.
A. 4 yr B. 2 yr C. 48 yr D. 3 yr
Determine the domain and range of the function.f(x) = 10x2 - 200x + 1001
A. Domain: (-?, ?) Range: (-?, 10] B. Domain: (-?, 10] Range: [1, ?) C. Domain: (-?, ?) Range: (-?, ?) D. Domain: (-?, ?) Range: [1, ?)
Solve the problem.The following table shows the price of several models of new cars along with the average number of repairs each model requires over a 5-year period. 
Find the equation of the line of best fit for the price and the number of repairs.
A. y = -0.365x + 10.4 B. y = -0.34x - 11.2 C. y = 0.37x + 9.9 D. y = -0.41x + 9.9
Find the exact value of the expression.sin 260° cos 20° - cos 260° sin 20°
A. - 
B. - 
C. 
D. - 