Solving for an indicated variable

[vrfulgen]

Homework Statement

http://mathway.com/math_image.aspx?p=tSMB012`SMB02RSMB03SMB02FSMB03mSMB10kSMB02fSMB03SMB02rSMB03?p=67?p=42

We are solving for k.

^click the link.

Homework Equations

The Attempt at a Solution

I know both sides need to be squared... maybe divide t by 2∏
This is probably really easy but I've been studying all day and I'm just not seeing it.

 

[dcassell]

It may be just me, but I don't even see a k in the problem...