What is the slope of a line perpendicular to the line whose equation is 12x-3y=81. Fully reduce your answer.

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

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?

I’m still confused on how to work the percentages