Which of the following graphs is a function?

the first graph is a function, (negative one)

Step-by-step explanation:

the reason is you can draw a line vertically and if it only touches one point it's a function. but if you do that to a circle like the the last graph it will touch two points meaning it's not a function.

$4034.40

the perimeter of the field is the sum of the lengths of the four sides:

47 yd + 158 yd + 47 yd + 158 yd = 410 yd

the cost of 3 ft (1 yd) of fence is 3×$3.28 = $9.84.

so the cost of jake's wood perimeter fance is

(410 yd) × ($9.84 /yd) = $4034.40