Will give brainliest if you explain

Write the equation in logarithmic form 8^x=64

Solve this problem! extra ! 3025/5.5 = a/90.75 / = fraction

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”?