4. How are the graphs of y = [4xand y = |4x| +4 related?
A The graph of y= [4x] + 4 is the graph of y=
|4x| translated down 4 units.
В The graph of y= [4x] + 4 is the graph of y=
14x translated up 4 units.
C The graph of y= [4x+ 4 is the graph of y=
|4x| translated to the left 4 units.
D The graph of y = |4x[ +4 is the graph of y=
|4x| translated to the right 4 units

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

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?

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