The approximate number of hours between sunrise and sunset in Denver, Colorado, varies throughout the year as shown in the graph. This variation is approximated by the sine wave shown below. Write the trig equation for the graph (cosine).

What is the inverse of the function f(x)=2x+1

A50% increase followed by 33 1/2% decrease

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?