Find the exact length of the third side

Step-by-step explanation:

if the length of the third side = a

a² + 13² = 85²

a² + 169 = 7,225

a² = 7,225 - 169

a² = 7,056

a = square root 7,056

a = 84

So, the length of the third side is equal 84 unit.

x=-7

step-by-step explanation:

x+3=-10

-10+3=-7

x=-7

really really sorry if i'm

-12 -5(x + 4) = 3x

-12 - 5x - 20 = 3x

-12 - 20 - 5x = 3x

-32 - 5x = 3x

    + 5x   + 5x

-32 = 8x

8         8

- 4= x