A sandwich stand at a ball game sold 15 hotdogs and 8 hamburgers for $97 in one hour. Another hour, the stand sold 12 hotdogs and 7 hamburgers for $81.50. Set up and solve a system of equations to figure out how much the stand was charging for the two menu items.

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

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?

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?