Solve the system of equations using Gaussian elimination or Gauss-Jordan elimination.-7x - 7y = -21-4x + 3y = 9
A. (-1, 4)
B. (0, 4)
C. (0, 3)
D. No solution
Answer: C
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Find the derivative of the function.f(x) = log8 (x7 + 1)
A. 
B. 
C. 
+ 7x6
D. 
Write an equation for a function whose graph fits the given description.The graph of f(x) = 
is reflected across the y-axis. This graph is then vertically stretched by a factor of 3.1. Finally, the graph is shifted 2 units downward.
A. f(x) = 3.1
+ 2
B. f(x) = 3.1
- 2
C. f(x) = 2
- 3.1
D. f(x) = -3.1
- 2
State using percents.In a survey of 100 people, 1 preferred ketchup on their hot dogs. What percent preferred ketchup?
A. 0.01%
B. 1%
C. 
%
D. 0.1%
Use Bayes' rule to find the indicated probability.Quality Motors has three plants. Plant 1 produces 35% of the car output, plant 2 produces 20% and plant 3 produces the remaining 45%. One percent of the output of plant 1 is defective, 1.8% of the output of plant 2 is defective and 2% of the output of plant 3 is defective. The annual total production of Quality Motors is 1,000,000 cars. A car chosen at random from the annual output and is found defection. What is the probability that it came from plant 2?
A. 0.35 B. 0.559 C. 0.224 D. 0.217