exam Maths Puzzle Numerical Ability

For each of the relationships below, explain whether you think it is best described by a linear function or a non linear function. explain your reasoning thoroughly.

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exam Other Question

A CERTAIN WATER LILY GREW EXTREMELY QUICKLY AND DOUBLED ITS SURFACE AREA EACH DAY. AT THE END OF THE 13th DAY, IT HAD ENTIRELY COVERED THE POND IN WHICH IT LIVED. IF A SENCOND WATE Is it possible for a cubic polynomial function to have no real zeros? Please mention any properties of polynomials in the explanation.

Thank you,

Lucy