If y varies directly as x, find the constant of variation if y= 32 when x= 8

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”?

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9

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