$\"\"$

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The formula for penny size(d) of a nail is $\"\"$ where n is the length(in inches) of the nail.

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Solve $\"\"$ for n.

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Add 2 to each side.

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$\"\"$

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$\"\"$

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Divide each side by 4.

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$\"\"$

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Cancel common terms.

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$\"\"$ . $\"\"$

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Substitute the values of $\"\"$ for d in the formula $\"\"$ .

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If $\"\"$ then $\"\"$ .

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If $\"\"$ then $\"\"$ .

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If $\"\"$ then $\"\"$ .

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If $\"\"$ then $\"\"$ . $\"\"$

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(a) The value of $\"\"$ (b) The lengths of the nail are 1.75 in, 3.5 in, 4.5 in and 5.5 in.