at a local zoo, adult visitors pay $3 and children visitors pay $1. on one day, the zoo collected a total of $720. if the zoo had 420 visitors tgat day, how many adults and how many children visited?

Which expression is equivalent to 4 square root 6 divided by 3 root 2

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable