exam Maths Puzzle Numerical Ability

CAN SOME ONE HELP ME WITH THIS PROBLEM.
SOLVE ALGEBRAICALLY AND CHECK YOUR POTENTIAL SOLUTIONS

SQUAREROOT X+20-X=0

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exam Other Question

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) Can you think of a real life situation where a straight-line graph might be applicable and why you think it might be true? Think about a real life situation that follows a linear