book Maths Puzzle Numerical Ability

y=x-9 (7,10) find the point for a slope

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book Other Question

Find the three arithmetic means between 18 and -10 I HAVE TO FACTOR THE POLYNOMIAL COMPLETELY. BUT I AM STUCK.

128xcubed yto the sixth - 50xto the sixth ycubed
it should look like this
128y3x6-50x6y3
WHAT DO I DO??PLEASE HELP ME. THANKS!