# A blue spruce grows and average of 6 inches per year. A hemlock grows an average of 4 inches per year. If a blue spruce is 4 feet tall and a hemlock is 6 feet tall, when would u expect the trees to be the same height?

##### 1 Answer

See a solution process below:

#### Explanation:

The expression for the height of the blue spruce would be:

The expression for the height of the hemlock would be:

We can now equate these two expressions and solve for

It would be expected to take 12 years for both trees to be the same height.