Question

A small submarine started its dive at sea level and descended 30 feet per minute. which integer represents the the submarines depth after 7 minutes?

Answer 1

$Distance \: covered \: in \: a \: minute \: by \\a \:small \\submarine = 30 \: ft$

$Distance \: covered \: in \: 7\: minute \: by \\the\:small \\submarine = 7 \times 30 \: ft\\= 210 \:ft$

$But \: submarine \: descended \: so \: we \: take \: negative \: sign$

Therefore.,

$\red { The \: integer \: represents \: the }\\\red{ Submarine \: depth \: after \:7 \: minutes }\\\green { = - 210 \: ft }$

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