The model below shows the number 9.99. ONES TENTHS HUNDREDTHS 9 . 9 9 Using the model of 9.99, how does the 9 in the tenths place compare to the 9 in the place to its right?

Triangle xyz has vertices x(1,3), y(0,0)

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

How can you tell when x and y are not directly proportional?