writting expressions

[amanissy]

A tank is filling with water from a natural spring. Two days ago the water was 10 feet deep. and yesterday the water was 12 feet deep. Assume that the water depth continues to rise at the same rate after today. How do you write this expression.

 

[chandra21]

it is a arithmatic progression with common difference 2 whose first term is 16(since you consider it after today. So the expression will be 16+2n,where n is a natural number.

 

[HallsofIvy]

A tank is filling with water from a natural spring. Two days ago the water was 10 feet deep. and yesterday the water was 12 feet deep. Assume that the water depth continues to rise at the same rate after today. How do you write this expression.

What expression? If you want to know how to write the "rate at which the tank is filling", it is "2 feet per day". If you want to write the "depth of water in the tank, t days after today, it would be 14+ 2t.

(I am assuming that "the same rate after today" is the same as the previous rate. One could certainly interpret this to mean that the rate changes to day and then stays the same, but since we are not told what that new rate is, there would be no way to answer the question.)