exam Maths Puzzle Numerical Ability

What is the equation of the line whose slope is -4 and whose y - intercept is 5?

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exam Other Question

Mrs Tan bought a DVD player and a HI-FI set at a discount of 20%. She paid a total of $2800. If the price of the DVD player is 40% that of the HI-FI set, what was the price of the DVD player before the discount? f(x) = 3x + 2
f(x) = x2 + 5x + 6
f(x) = x3 + 3x2 + 2x + 1
f(x) = ex
f(x) = log x
give the order of the rate of change of the five functions, from slowest to fastest.