Any answers help, on explanations needed

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

What is the value of x? enter your answer in the box. photo attached.

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