Examples: during a flight, a hot air balloon is
observed by two persons standing at points a and b
as illustrated in the diagram. the angle of elevation
of point a is 28°. point a is 1.8 miles from the
balloon as measured along the ground.
17. what is the height h of the balloon?

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.