exam Maths Puzzle Numerical Ability

y=123.52x+89.32
y=-89.22x+33.76

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exam Other Question

The organizers of a walkathon get cost estimates from two printing companies to print brochures to advertise the event. The costs are given by the equations below, where C is the c what is the value of x in this equation
2 raise to the -5 = (1 + 0.23x)raise to -3