Which expression is not equivalent to 3x– 2?
Ox+x-1-1+x
O 2x+ 2+x
O3-r+ 2r-5 + 2x
O 4x- 4-x+2 will mark brainless

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”?