exam Maths Puzzle Numerical Ability

Find the area of a circle with a diameter of 4 ft.

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exam Other Question

How do I solve using a system of two equations in two variables?

The sum of the digits of a two-digit number is 9. The value of the number is 12 times the tens digit. Find the number.

I think the first equation is x+y=9 Hi and thank you for your help if you can.

My problem is an intermediate algebra problem

2-3[-4+6]/(-2) Simplify.

Nichell Bailey p.s I never know where to begin first.