Emily practices piano for 2/3 of an hour on Mondays and 1/2 of an hour on Wednesdays. How many hours does Emily spend practicing piano in one week?
A. 2/6 hour
B. 1 1/6 hours
C. 1 3/8 hours
D. 1 1/2 hours

Find the solution of this system of equation -7x+y=-20 9x-3y=36

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39

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?