<span>A=<span><span>3<span>(5+7)</span></span>2</span>=<span><span>3<span>(12)</span></span>2</span>=<span>362</span>=18<span> km^2</span></span>
Answer:
Step-by-step explanation:
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21 + 3a
3 (7+a)
distribute 3 into parentheses:
x = 3
Steps:
There you go!