exam Maths Puzzle Numerical Ability

Iam having difficulty graphing polynomials and Rational Functions particuarly in finding the X and y intercepts.
Sketch the graph of the Rational function

2x^2 + 5x + 3/x-4

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exam Other Question

I have a word problem....The product of three and a number decreased by seven is seventeen. What is the number? I need to formulate an equation. I wish word problem made since to me. Thank you Solve each formula in terms of the given variable.
1. C = 2(3.14) for r
2. 3.14 = C/d for d
3. P = 2L + 2w for L
4. S = L + 2B for B
5. V = Lwh for h
6. P = 4s for s
7. A =