A set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. What percentage of scores is greater than 160? NEED AN ANSWER PLZZ

Add, subtract, multiply, or divide as indicated. list any restrictions for the variable(s) and simplify the answers when possible. 1) x-2 / x+5 + 3x / 2x-1 2) x+6 / x-6 - x^2 / x+6 3) x+9 / x-4 + x+2 / x^2-11x+28 4) x / x^2-64 + 11 / 2x^2+11x-40 5) 5 / x + 11 / x-3 - x-4 / x^2+2x-15

What is the value of the discrimination for the quadratic equation 0=×2+2+×2

Me on this i beg you on this to answer!