exam Maths Puzzle Numerical Ability

graph the quadritic equation

y= x^2 +2x

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exam Other Question

3 to the -x power is equal to (1/3) to the x power....how do i prove this mathematically? Can someone help me on this problem?

A student got the following scores on five math tests: 91, 88, 94, 95, 85. I need to determine the range of the scores.

Thanks,
Ashley