Thurston wants to retire in nevada when he is 80 years of age. thurston, who is now 55, believes he'll need $400,000 to retire comfortably. to date, he has set aside no retirement money. to get an interest rate of 6% compounded annually, he'll have to invest today. using the tables found in the textbook, determine how much he must invest.

the perimeter is increased by a factor of 2

sample answer: you can determine whether each element of the domain is paired with exactly one element of the range. for example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.