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)}

Which property is illustrated by the following statement? if hxa rgi, then rgi hxa.

In the 30-60-90 triangle below side s has a length of and side r has a length

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.