Model with one-step equations and solve 0 Kojo wants to be an author. To improve his writing skills, every day after school he writes 3 pages of a story he is working on. Kojo has been writing his story for d days. He has a total of 81 pages completed. Write an equation to describe this situation. How many days has Kojo been writing his story?​

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?