Why are rocks like limestone and mudstone found in inland parts of South Australia?

How can you decide witch operations to use to slice a two step equation

One integer is 5 more than another. their product is 104. find the integers

The weights of broilers (commercially raised chickens) are approximately normally distributed with mean 1387 grams and standard deviation 161 grams. what is the probability that a randomly selected broiler weighs more than 1,425 grams?