How can models and equations me subtract like fractions

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(t)=728(1+0.04)^t how much money did aditya originally invest

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?