Which system of equations is equivalent to the following system? 2x + 4y = 14 4x + y = 20 2x + 4y = 14 −16x − 4y = −80 2x + 4y = 14 −4x + y = −20 4x + 8y = −28 4x + y = 20 −2x − 4y = 14 4x + y = 20

10 ! in a race, nick is 50 feet in front of jay after ten seconds. how fast can nick run, if jay can run 20 feet per second?

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

The table below shows the approximate height of an object x seconds after the object was dropped. the function h(x)= -16x^2 +100 models the data in the table. for which value of x would this model make it the least sense to use? a. -2.75 b. 0.25 c. 1.75 d. 2.25