What is the area of the parallelogram

Ineed me i stuck and i don’t want to get it wrong

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers

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”?