exam Maths Puzzle Numerical Ability

subtract 8.3-10.7

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exam Other Question

Please help,

Find the value for the correlation coefficient r.

x 5, 1, 4, 2, 3
y 5, 10, 12, 4, 8

Please help
Find the GCF of the product. (3b + 6)(2b - 10)

thanks