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Genesis's math teacher finds that there's roughly a linear relationship between the amount of time students spend on their homework and their weekly quiz scores. This relationship can be represented by the equation $y=6.3 x+66$, where $y$ represents the expected quiz score and $x$ represents hours spent on homework that week. What is the meaning of the $x$-value when $y=90$ ?$\newline$A student's expected quiz score if they spent $1$ hour on their homework.$\newline$A student's expected quiz score if they spent $90$ hours on their homework.$\newline$The change in expected quiz score for every additional one hour students spend on their homework.$\newline$The number of hours a student should spend on their homework to expect a score of $90$ on the quiz.