Can someone explain to me how to do this

Average salary for a medical assistant is $31,220 which is a 20% income tax bracket how much money would they pay in income tax?

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

Explain how you can find the missing fraction in 3 4/5 / (blank) 2 5/7. then find the missing fraction.