What is the Answer of this simplified? 2a+4b-11ab-6b

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?

In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)