<span>2+4+12+16=34 COINS TOTAL.
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The width is 3m because 3*7 is 21m^2. Also they said the length is 4 more than the width (3+4=7)
Look at the attachments and those are the answer.
180-2y+10
190-2y
But I’m not sure how you want it solved like get the variable alone etc but lmk