Carlos begins his workout by stretching. then he spends an equal amount of time on each workout machine. the equation y = 8x + 10 represents the total time, in minutes, of carlos' workout if he uses x workout machines. explain what the slope and y-intercept of the equation represent in this situation.

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?