exam Maths Puzzle Numerical Ability

simplify and combine like radicales

3~3:(8x)+3~3:(27x)

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exam Other Question

solve each system by graphing.
y=-1
y=5/2x+4 Brazil nuts sell for $5 per pound and walnuts are sell for 3.50 per pound. How much of each type of nut would be needed to create 30 pounds of a mixture that would sell for $4 per pound?