12/7 as a mixed number

The table shows the balance of a money market account over time. write a function that represents the balance y(in dollars) after t years.

Gregory draws a scale drawing of his room. the scale that he uses is 1 cm : 4 ft. on his drawing, the room is 3 centimeters long. which equation can be used to find the actual length of gregory's room?

Combine like terms to make a simpler expression 3z+z