1 cm represents 3.5km 2.4cm represents x km

What is the slope of the line shown below?

How do i put 3(x+7) in distributive property

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”?