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I would plot the points so it is easier for me to see which three distances to calculate.

|dw:1437665201466:dw|

once you find all the side lengths
you add the side lengths to find the perimeter

ok

so have you computed the distance between (2,4) and (-3,-6) ?

no

|dw:1437665675706:dw|
well you still need to find these two distances (these two side lengths)

I got 10

39 and 125

do you mean sqrt(125) for d_3 ?

yes

|dw:1437665932861:dw|
now you just need to find d_2

which is the distance between (4,-2) and (-3,-6)

use that formula above to find it

I got 10

11

4-(-3)
is the same as
4+3
-2-(-6)
is the same as
-2+6

\[d_2=\sqrt{(4+3)^2+(-2+6)^2}\]

compute 4+3 and -2+6
then square both results

then add those results

i got 11

sounds like you are doing (4+3)+(-2+6)
which means you are ignoring the squares

(4+3)^2=(7)^2
(-2+6)^2=(4)^2

\[d_2=\sqrt{(4+3)^2+(-2+6)^2} \\ d_2=\sqrt{(7)^2+(4)^2}\]

you square the numbers before adding them
because that is what order of operations tells us to do

29
65

don't know where the 29 comes from
but sqrt(49+16)
is sqrt(65)

okay

|dw:1437666447857:dw|
now add all the sides to find the perimeter

239

230

so you added sqrt(125) and sqrt(40) and sqrt(65)?

or did you add 125 and 40 and 65?

because those aren't the same numbers

i added them all

25.567

ok and you are suppose to round to 2 decimal places so that would actually be...

25.57

yes