exam Maths Puzzle Numerical Ability

Determine whether each ordered pair is a solution of the inequality x + y > 3. I'm just really having problems with all this. thanks.

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exam Other Question

The total cost function of a company producing two units A & B is of the form

c( x,y) = ax^2+by^2+c

where x is the number of units of A produced and Y is the number of of un
If R(x) is a rational function, then R(x) < 0 describes what?
a. The values of x that make R(x) positive in value
b. The values of R(x) that make x negative in value
c. The val