Use compatible numbers to estimate the question 28÷232

Find an equation of the line perpendicular to the graph.

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?

Acompany made a profit of 75000 over a period of 6 years on an initial investment of 15000 what is the annual roi