exam Maths Puzzle Numerical Ability

When substituting for a variable in a function graph, how do I select the correct substitution for the variable.

Example: f(x)=-7(x)

When making a graph, I am not sure how to get the input, and output.

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exam Other Question

1.) Perform the indicated operations:

a.) b^3 - b^2 + 3b - (b - 3) + (3 - 2b^2 + 3b^3)=

b.) -3(3 - b)(3 + b) =

c.) (c - 3)^2=

d.) (a - b)(a^2 + ab + b^2)=

e.) 6c^2 - 12c +3 / -3c = I dont know how to set it up:
The length of a standard basketball court can vary from 84 feet to 94 feet, inclusive. Write an absolute value inequality that describes the possible lengths of a standard basketball court.