exam Maths Puzzle Numerical Ability

The sum of a number, and the difference between 16 and a number, plus 5 is 21. What is the number

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exam Other Question

Could someone show me these on a graph. graphing inequalities.
1) 4x+y>-8
2) x+4y less than or equal to 4
3) 9x+y<7
I was doing fine on my homework in till I came to a couple of questions that I could not figure out, if you could help me I would really appreciate it.
Here is the problem 2x+1/x