In one day, The Tool Shed rented out 25 self-propelled and riding mowers for a total fee of $900. The daily rental cost was $20 for each self-propelled mower and $40 for each riding mower. Find the number of self-propelled mowers (x) and the number of riding mowers (y) rented for that day. 5 self-propelled mowers and 20 riding mowers
18 self-propelled mowers and 7 riding mowers
8 self-propelled mowers and 17 riding mowers
12 self-propelled mowers and 13 riding mowers

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?