exam Maths Puzzle Numerical Ability

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

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exam Other Question

A data set of size 19 has a correlation coefficient of r = -0.432. Test the significance of r at the 5% level and at the 1% level.
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I am so confused. Please help,

Ellen Find the GCF of each product.
(6y^2-3y)(y+7)