Please Help me it’s question 8

If x + 10 = 70, what is x? a. 40 b. 50 c. 60 d. 70 e. 80

Match each inequality to the number line that represents its solution

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”?