Cate and Elena were playing a card game. The stack of cards in the middle had 27 cards in it to begin with. Cate added 8 cards to the stack. Elena then took 7 cards from the stack. Finally, Cate took 4 cards from the stack. How many cards were left in the stack?

15 point ! ~ see if you know the answer to both you!

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a. m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

Quadrilateral abcd in the figure below represents a scaled-down model of a walkway around a historic site. quadrilateral efgh represents the actual walkway. abcd is similar to efgh. what is the total length, in feet of the actual walkway?