George has $75 saved. He knows he can make $20 for each lawn he mows. He would like his savings account balance to be at least $500 by the end of the summer. Which inequality represents George's summer savings goal?
A. 75 + 201 ≥ 500

B. 75 + 201 ≤ 500

C. 751 + 20 ≥ 500

D. 751 + 20 ≤ 500

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”?