Last year, a baseball team paid $10 per bat and $6 per glove, spending a total of $520. this year, the prices went up to $15 per bat and $10 per glove. the team spent $830 to purchase the same amount of equipment as last year. how many bats and gloves did the team purchase each year?

The number of chocolate chips in an 18-ounce bag of chocolate chip cookies is approximately normally distributed with a mean of 1252 chips and standard deviation 129 chips. (a) what is the probability that a randomly selected bag contains between 1100 and 1500 chocolate chips, inclusive? (b) what is the probability that a randomly selected bag contains fewer than 1125 chocolate chips? (c) what proportion of bags contains more than 1225 chocolate chips? (d) what is the percentile rank of a bag that contains 1425 chocolate chips?