exam Maths Puzzle Numerical Ability

The cost of producing a number of items x is given by C = mx + b, in which b, in which b is the fixed cost and m is the variable cost (the cost of producing one more item).

(a)

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exam Other Question

An airplane took 2 hours to fly 600km against a head wind. The return trip with the wind took 1 2/3 hours. Find the speed of the plane in still air. CAN SOME ONE HELP ME WITH THIS PROBLEM.
SOLVE ALGEBRAICALLY AND CHECK YOUR POTENTIAL SOLUTIONS

SQUAREROOT X+20-X=0