At a party 53 people arrived. then 100 people came later on. what is the percent of change.

Combine like terms to make a simpler expression 3z+z

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?