exam Maths Puzzle Numerical Ability

Find a number that is 38 less than its opposite

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exam Other Question

y= -2x^+8x+11 I need to be able to graph this but the graph I'm given doesn't seem to work with this problem. Can you help?

Thank you A triangle has sides 3x+7, 4x-9, and 5x+6. Find the expression that represents its perimeter.