Emergency hw

Which of the following ordered pair could NOT be included in this set if it is a
function?
{(-4,2).(3,6),(4,3), (x, y) }

A. (x, y) = (3,6)
B. (x, y) = ( 4,-3)
C. (x, y) = (1,2)
D. (x, y)= (-3,6)

If f(x) = 3-2x and g(x) =1/x+5 to what is the value (f/g)(8)

Which of the following is the equation that says that the product of a number and ten is equal to 20 percent of that number ? a) 10n= 2.0n b) 10+n=.20n c) n+ .20n=10 d) 10n=0.20n

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?