Write a simplified expression for the perimeter of the polygon shown.

Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

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.