exam Maths Puzzle Numerical Ability

okay...so my next question:
Calculate the area in metric units:
Find the difference in the area of a straw with a diameter of 5mm and a straw with a diameter of 7 mm. (show your work)

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exam Other Question

I need to solve for X. The problem is 2x^2+24=x^2 i then moved the x^2 so that the problem read x^2+24=0 i have to factor it out. I also have to subtract X by five. X is a distance so it cannot be a negative number X must be greater than five. How do I solve using a system of equations in two variables?

Three times the larger of two numbers is equal to four times the smaller. The sum of the numbers i 21. Find the numbers.