exam Maths Puzzle Numerical Ability

Write an equation of a circle with center at the origin and radius 6.please help i am so bad at this

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exam Other Question

An airplane traveled 2660 miles in 3.5 hours with a tail wind. The return trip took 3.8 hours with a head wind. What was the speed of the airplane in still air? What was the speed of the wind? Solve by using a system oif equations. Can someone help me on this problem?

I need to evaluate: |6| + |-15|

Thank you,
Lyn