The Resistance $R$ Of a Wire Varies Directly as Its Length $L$

The resistance $R$ of a wire varies directly as its length $L$ and inversely as the square of twice its radius.
(a) Write an equation that expresses this direct variation.
(b) Find the constant of proportionality if a wire $2.4$ m long and
$0.004$ m in diameter has a resistance of
$150$ ohms.
(b), find the diameter of a wire that has a resistance of $90$ ohms and is
$1.2$ m long.
(c) Using the constant of proportionality from part

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(a)

(b) ,...

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