The cost of barbara’s dinner is $15.90 including tax. she leaves a tip that is 18% of the total cost of the dinner. what is the best estimate for the amount of the tip?

Solve 2x+y=3 x+y=5 in substitution method

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.

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much