exam Maths Puzzle Numerical Ability

The Louisiana Superdome covers an area of 363,000 square feet.
Find the diameter of this round arena to the nearest foot.

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exam Other Question

factor(x^2+7x-18) Can someone please help me graph the following problem? I sure am lost when it comes to graphing.

I need to solve the system by graphing:

3x + y = 6
3x - y = 0
Thanks so much,
Lyn