exam Maths Puzzle Numerical Ability

Please give me some input on this one:

For each item below, explaing whether you think it is best described by a linear function or a non-linear function.

a. The time it tak

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exam Other Question

A manufacturer of lighting fixtures has daily production costs modeled by y=0.25x^2-10x+800 where y is the total cost in dollars and x is the number of fixtures produced

How many fixtures should be produced each day to yield a minimum cost? Determine whether the following equations have a solution or not? Justify your answer.
2x2 + x - 1 = 0