exam Maths Puzzle Numerical Ability

The length of a rectangle is 4 less than 3 times the width. If the perimeter is 40, find the dimensions of the rectangle. What is this answer??

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exam Other Question

Which intervals are decreasing?
f(x) = x^3 � 12 x^2 + 36x + 1
I came up with (-6, -2), is this correct?

Thank you for inspecting this problem!

Also, I am trying to find t I am really confused, someone please help me

If arc AB is a minor arc of circle Q, then ___< arc AB<___