Find the mean and standard deviation of the specified probability density function.f(x) = e-x for [0, ?)
A. ? = 1, ? = 1
B. ? = 0.5, ? = 1
C. ? = 10, ? = 10
D. ? = 0.5, ? = 0.5
Answer: A
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Find the product.(-10)(-3)(3)
A. 90 B. 80 C. 190 D. -90
Solve the system of equations by the substitution method. If the system does not have a single ordered pair as a solution, state whether the system is inconsistent or dependent. x - 2y = -1-3x - 1y = 3
A. (-1, 0) B. No solution; inconsistent C. (0, -1) D. (1, -1)
Find the domain of the given function.f(x) = 
A. [-7, ?)
B. (- 
, ?)
C. (7, ?)
D. [
, ?)
Find the missing parts of the triangle. Round to the nearest tenth when necessary or to the nearest minute as appropriate.C = 105.8°a = 4.7 kmb = 8.3 km
A. c = 10.6 km, A = 25.2°, B = 49° B. No triangle satisfies the given conditions. C. c = 13.5 km, A = 27.2°, B = 47° D. c = 16.4 km, A = 23.2°, B = 51°