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Math·Algebra·Linear inequalities in one or two variables

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To win a game show, a contestant needs to score at least $70$ total points from two rounds. Correct responses in the first round are worth $3$ points each, and correct responses in the second round are worth $9$ points each. Which inequality models this situation, where $f$ is the number of correct responses in the first round and $s$ is the number of correct responses in the second round?

A

$f+s\le 70$

B

$3f+9s\ge 70$

C

$9f+s\ge 70$

D

$9f+3s\le 70$