book Maths Puzzle Numerical Ability

Solve b^4+2b^2-24=0

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I can't seem to get the answer to this problem.

r=-0.08p^2+300p

Factor out the price on the right hand side of the formula
a line of best fit is a line drawn on a scatter plot that shows the trend in the data. looking at the pattern of differences, you might think that the population has increased by a