What percentage of the bill amount should you leave as a tip for a waiter at a dine-in restaurant

What is the length of the missing leg in this right triangle? 18 mm 24 mm 26 mm 32 mm

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry