exam Maths Puzzle Numerical Ability

A restaurant chef mixes 20 lb. of snow peas costing $1.99 a pound with 14 lb. of petite onions costing $1.19 a pound to make a vegetable medley for the evening meal. Find the cost per pound of the mixture. (You must show alg. to receive full credit)

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exam Other Question

I need some help with these problems I am having problems

Factor completely x^3-x^2-20x

and also

solve: 3/x-1=6/x+2

Thank you
Solve for the indicated letter.

Solve the formula
S =1/3 pi2^2h + 4 pirh for r.