Geometry please help

Two sides of a triangle mesure 20cm and 30cm. what is the measure of the third side

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

If abcde is reflected over the x-axis and then translated 3 units left, what are the new coordinates d?