exam Maths Puzzle Numerical Ability

Write the equation of the line which has y-intercept (0, 5) and is perpendicular to the line with equation y = �3x + 1.

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exam Other Question

Suppose that N=squareroot(x)+3 models the number of cases of an infection, in millions, of a disease x years from now.Approximately how many cases of the infection will there be 9 years from now? approximately how many years will there be 5 million cases The cost of producing a number of items x is given by
C = mx + b, in which b is the fixed cost and m is the variable cost (the cost of
producing one more item).
(a) If the fixed