Cole has $5 and $20-bills in his wallet. He has 7 more $5-bills than $20-bills. Let x be the number of $20-bills. If Cole has a total of $310 in his wallet, then algebraically find the value of x. ​

Simplify.7x + 3y - 2 + 6x + 1 + y squared 2 you! ; )

Last year, a state university received 3,560 applications from boys. of those applications, 35 percent were from boys who lived in other states. part a)how many applications did the university receive from boys who lived in other states? part b)applications to the university from boys represented 40percent of all applications. how many applications did the university receive in all? i don't how to do part b so me and plz tell how you got your answer

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”?