Indicate whether the equation represents direct variation, inverse variation, or neither. If it is a variation equation, identify the constant of proportionality.y = - 
x
A. direct variation; k = - 
B. inverse variation; k = -3
C. direct variation; k = -3
D. neither
Answer: A
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Solve the problem.The annual rainfall in Maine is a random variable with probability density function defined by 
for x in 
Find the probability that the rainfall is less than the expected value of the rainfall.
A. 0.500 B. 0.447 C. 0.445 D. 0.489
Find n for the given value of an in the arithmetic sequence.an = 356?; 6?, 13?, 20?, . . .
A. n = 53 B. n = 50 C. n = 51 D. n = 49
Compute the discriminant. Then determine the number and type of solutions for the given equation.x2 + 2x + 1 = 0
A. 4; two unequal real solutions B. -4; two complex imaginary solutions C. 0; one real solution
Solve the application. Write the following number in scientific notation.The life span of the average male human being is approximately 37,843,200 minutes.
A. 3.78432 × 106 minutes B. 3.78432 × 107 minutes C. 37.8432 × 106 minutes D. 3.78432 × 105 minutes