Can anyone give me the answer to these questions? :)

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

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?

Solve for b. ab + c= d b= a + old ob=allc-ch b= (d-c/a