A wire was shaped to form a square of area 81cm². An equilateral triangle was formed by
the same wire. What is the length of a side of
the triangle formed?

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

The perimeter of a stage is 116 feet. it is 17 feet wide. how long is it?

Trent wants to buy 2 packs of trading cards for 3 dollars each. the trading card packs that trent normally buys tend to come in packs of 6, 10, 12, or 15 cards. after selecting 2 packs, trent found that the first pack of cards cost 25 cents per card, and the second pack cost 30 cents per card. trent uses this information to write the equations below in order to compare c, the number of cards in each pack.