exam Maths Puzzle Numerical Ability

Please help me factor completely. Thanks!

3a^2-12a+12

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exam Other Question

Write the scale w/o units.

31. 1 in.: 9yd

Any help with this equation would be Greatly</b> appreciated.
add express in simplest form

x^2
over
x+10

plus
9x-10
over
x+10