exam
Maths Puzzle
Numerical Ability
darren used pieces of moulding 7 1/2 feet long, 2 3/4 feet long and 7 1/2 feet long to frame a doorway. If he started with 20 feet of moulding, how much was left over?
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exam Other Question
Simplify
x^2 - x - 6 x^2 + 6x + 8
___________ . ____________
x^2 - 16 x^2 + x - 12
w+3x-y+2z =-4
w-2x+3y+5z=-3
3w+2x+y+z=9
2w-x+2y+z=7
I need to know what w,x,y,and z
Please help me Im so lost.