Anyone know the answer, because I need help.

204 mi

Step-by-step explanation:

First we need to find the value of a using the Pythagorean theorem

a^2 + b^2 = c^2

a^2 + 68^2 = 85^2

a^2 +4624=7225

a^2 = 7225-4624

a^2 =2601

Take the square root of each side

sqrt(a^2) =sqrt(2601)

a =51

P = sum of all three sides

P = 51+68+85

  =204

step-by-step explanation:

x^2 -12x + 36 + y^2 = 36

x^2 + y^2 = 12x

r^2 = 12rcos(theta)

r = 12 cos(theta)

-362

step-by-step explanation:

(12)(4)+2(12)-34(12)+2(12)-3

  \/         \/         \/         \/

  48 +   24 -   408 + 24 - 3

      \   /               \   /

          72     -     432 - 3 = -363