Can somebody teach my how to find the length of the third side of a triangle?

For the equations below which statement is true ?

Which is the solution to the inequality? 2 3/52 1/15 b< 3 2/15 b> 3 2/15

Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 25002500 grams and a standard deviation of 800800 grams while babies born after a gestation period of 40 weeks have a mean weight of 27002700 grams and a standard deviation of 385385 grams. if a 3232-week gestation period baby weighs 21252125 grams and a 4040-week gestation period baby weighs 23252325 grams, find the corresponding z-scores. which baby weighs lessless relative to the gestation period?