Choose the answer based on the most efficient method as presented in the lesson.

if the first step in the solution of the equation -x + 6 = 5 - 3x is "subtract 5," then what should the next step be?
add 3x
subtract 6
add x

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”?