The table shows sets of ordered pairs that form a relation.
does each set of ordered pairs represent a function?
select function or not a function for each set of ordered pairs.
set of ordered pairs
function
{(2, -3), (3, -3), (1,4), (9, 2)}
{(8, -3), (3,8), (9,4), (-2, 2)}
{(1, -,8), (9, -1), (3, 2)}
{(1, -,, –,2)}

The head librarian at the library of congress has asked her assistant for an interval estimate of the mean number of books checked out each day. the assistant provides the following interval estimate: from 740 to 920 books per day. what is an efficient, unbiased point estimate of the number of books checked out each day at the library of congress?

The table below shows the height of a ball  x  seconds after being kicked.  what values, rounded to the nearest whole number, complete the quadratic regression equation that models the data? f(x)  =  x2  +  x  +  0based on the regression equation and rounded to the nearest whole number, what is the estimated height after 0.25 seconds?   feet

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.