I will mark Brainliest for first and correct answer. PLEASE NO LINKS Mark checks the cost of pens at several stores to determine the best deal. Which choice gives the lowest cost per pen?

a) $7 for a pack of 5 pens
b) $15 for a pack of 10 pens
c) $18 for a pack of 15 pens
d) $48 for a pack of 30 pens

Please also explain how you got the answer even better the working

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

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?

What function has a range {yly< 5}? question on picture above^