Determine whether the relation represents a function. If it is a function, state the domain and range.
A. function
domain:{20, 30, 40, 50}
range: {4, 6, 8, 10}
B. function
domain: {4, 6, 8, 10}
range: {20, 30, 40, 50}
C. not a function
Answer: B
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Solve the problem.The strength S of a wooden beam with rectangular cross section is given by the formula S = kd3 sin2 ? cos ?where d is the diagonal length, ? the angle illustrated, and k is a constant that varies with the type of wood used. 
Let d = 1 and express the strength S in terms of the constant k for ? = 45°, 50°, 55°, 
and 65°. Does the strength always increase as ? gets larger?
What will be an ideal response?
Evaluate.2(x + y) and 2x + 2y when x = 10 and y = 8
A. 28, 36 B. 28, 30 C. 36, 36 D. 28, 28
Determine whether the graph of the equation is symmetric with respect to the x-axis, the y-axis, and/or the origin.y = 3x2 + 3
A. x-axis B. y-axis C. origin D. x-axis, y-axis, origin E. none
Provide an appropriate response.How can you use the vertical line test to determine if a graph represents a function?
What will be an ideal response?