What is a reason that we need to be able to use the quadratic formula rather than solving all quadratic equations by graphing?

The probability that a college student belongs to a health club is 0.3. the probability that a college student lives off-campus is 0.4. the probability that a college student belongs to a health club and lives off-campus is 0.12. find the probability that a college student belongs to a health club or lives off-campus. tip: p(a or b) = p(a) + p(b) - p(a and b) 0.54 0.58 0.70 0.82

A+b= 17, ab=70, find the value of |a-b|

The product of 3 and a number increased by 8 is 31 written as an equation