exam Maths Puzzle Numerical Ability

The Length of a rectangle is twice the width; the perimeter is 42 inches. Find the width

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exam Other Question

The cost of stainless steel tubing varies jointly as the length and the diameter of the tubing. If a 5 foot length with diameter 2 inches cost $48.00, how much will a 13 foot length with diameter 6 inches cost?

help set up HI! May I get some help with this expression?

Evaluate the expression and write the result in the form a + bi.

(6 + 5i)^-1