exam Maths Puzzle Numerical Ability

Suppose Petra could not find her credit card bill and did not remember the amount of her bill. Could you still determine the cost of her items? Why or why not?

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exam Other Question

Use cross products to determine whether each of pair of ratios forms a proportion:

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Please explain how to solve this problem. Consider the function P(x)=x(30-x). Is this function odd, even or neither? What do you expect if you graph this function?