exam Maths Puzzle Numerical Ability

Find an equation of the circle of radius 4 that is tangent to both branches of the graph y=|x|

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exam Other Question

I need your help please, A triangle has a perimeter of 161 miles. Each of the two smaller sides are two thirds the length of the longest side. Find the length of each side of the triangle. Can someone please tell me:

Which label describes the following?
3x + 6 = 10
Expression?
Linear equation?
Equation which is not linear?