What is 3/20-3/45+5/12 in simplest radical form

Anyone know? will mark brainliest if correct!

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

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”?