Which relation describes a function?
a) {(0, 0), (0, 2), (2, 0), (2, 2)}
b) {(−2, −3), (−3, −2), (2, 3), (3, 2)}
c) {(2, −1), (2, 1), (3, −1), (3, 1)}
d) {(2, 2), (2, 3), (3, 2), (3, 3)}

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

If value of cos330° is √3/2 then find tan165°.

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?