Solve using the quadratic formula. Show all work. Write each solution in simplest form. No decimals.

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?

Justin has 750 more than eva and eva has 12 less than justin together they have a total of 63 how much money did

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”?