exam Maths Puzzle Numerical Ability

I need help solving:

7x-{3[4(x-2)-3(x+1)]-5(2x-3)}

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exam Other Question

A grocery store sells a mixture of peanuts and raisins for $1.75 per pound. If peanuts cost $1.25 per pound and raisins cost $2.75 per pound, what amount of raisins ans peanuts go into 1 pound of the mixture? I need help simplifying this...I am totally stumped!

Square root 12x + 2(square root x) + square root 50x

Thanks so much!