Trent plants a sunflower that is $6$ inches tall. The sunflower is expected to grow at an average rate of $1.5$ inches per day during the next month.

A. Create an equation that Trent can use to find the number of days, $x$, it will take the sunflower to grow to a height of $45$ inches and find how many days will it take the sunflower to grow to a height of $45$ inches?