Raise u to the 4th power then triple the results

What basic trigonometric identity would you use to verify that sin x cos x tan x =1-cos^(2)x?

Solve the equation w^3 = 1,000 i honestly dont know how to punch this into a calculator pls

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?