exam Maths Puzzle Numerical Ability

find the value of the expression 10C8
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10C8 is the same as 10C2
10C2 = [10*9]/[1*2] = 45
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Cheers,
Stan H.

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exam Other Question

2x+5-3(x+7)=4-6x

(x+2)(3x-5)=3x(x-8)+15
find the points (x,y) common the both of these lines
x+y=5
3x-2y=0
please help me!