Solve the problem. Round to the nearest hundredth of a percent if needed.Use of the internet for shopping is increasing dramatically, but still is somewhat age dependent. When a popular web site that sells books asked the age of users who bought products from them over the internet, they obtained the following data. What is the probability that a buyer on this web site is aged 
A. 4.17%
B. 2.66%
C. 2.59%
D. 4.13%
Answer: C
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A plane in three dimensional space can be written as ax + by + cz = d. We can find the possible intersections of planes in this form by writing them as systems of linear equations and using reduction to solve them. If d = 0 in each equation, then we have a homogeneous system with either a unique solution or infinitely many solutions.Determine whether the intersection of the planes: 
has a unique solution or infinitely many solutions; then solve the system.
What will be an ideal response?
Choose the graph of the equation.x2- y2- z2= 1
A. 
B. 
C. 
D. 
State whether the function is linear or quadratic.f(x) = 9x - 3
A. Linear B. Quadratic
Use the Gauss-Jordan method to solve the system of equations. 3x - y + 4z = 52 -7x - 5z = -89 3y + z = 11
A. (-7, 1, 14) B. (7, 8, 1) C. (7, 1, 8) D. No solution