Evaluate the exponential function at the specified value of x.f(x) = 4x, x = 0.5
A. 2
B. 4
C. 
D. 
Answer: A
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Solve the problem.In statistics, the sampling distribution of the random variable Z = 
is the standard normal distribution, where 
is the sample mean, ? is the population mean, ? is the population standard deviation, and n is the sample size. Simplify this expression.
A. Z = 
B. Z = 
C. Z = ?
(
- ?)
D. Z = 
Solve each of the following systems of equations. If the system is inconsistent or dependent, say so.- x - 7y = -4-4x + 7y = 19
A. (-3, 1) B. (-2, 0) C. No solution D. (-1, -3)
Use < or > for ? to write a true sentence. Draw a number line if necessary.1349 ? 1351
A. < B. >
Find the vertex, focus, and directrix of the parabola with the given equation.(x - 1)2 = 20(y - 3)
A. vertex: (-1, -3) focus: (-1, 2) directrix: y = -8 B. vertex: (3, 1) focus: (3, 6) directrix: y = -4 C. vertex: (1, 3) focus: (1, -2) directrix: x = 8 D. vertex: (1, 3) focus: (1, 8) directrix: y = -2