Arailroad crew can lay 7 miles of track each day. they need to lay 203 miles of track. the length, l (in miles), that is left to lay after d days is given by the
following function.(d) =203-7d (also asks how many miles to lay after 18 days and how many days will it take to lay all the track)

Haley buys 9 pounds of apples for $3. how many pounds of apples can she buy for $1?

What is the value of f(x) = 2.2 for f(-2)?

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?