exam Maths Puzzle Numerical Ability

I need to strengthen a mixture that is 10% alcohol to 30% alcohol. How much pure alcohol should be added to 7 liters of the 10% mixture?

How many liters of 94-octane gas should

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exam Other Question
Could you please help solve for the following
Consider the function f(x)=x^2+4x+1
a) Find h, the x-coordinate of the vertex of this pabola.

B) Substitute the two integers imm Can someone please show me how to simplify this?

Square root 36x^5 (fifth power)

Thank you!