Prove that CosecA - CotA = Sec²A + Cosec²A

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?

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122