Problem Kiersten runs a website that helps people learn programming. Every month, Kiersten receives a subscription fee of $10\$10$10dollar sign, 10 from each of the subscribers to her website. Last month, the website had 100100100100 subscribers. This month, 30303030 new members joined the website, and 10101010 members cancelled their subscription. How much money will Kiersten's online business earn this month?

$1200

Step-by-step explanation:

Every month, Kiersten receives a subscription fee of $10 from each of the subscribers to her website.

Last month she had 100 subscribers. This month, 30 new subscribers joined and 10 members canceled their subscription. The amount of subscribers she has now is:

100 + 30 - 10 = 120

This means that this month, Kiersten will earn:

10 * 120 = $1200

expression #3 is not equivalent. the others are.

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