Do (10 x 10) then (10 x 20), and then add your two answers together.
Its simple :)
where's the rest of question so I can help?
You have to have a better question to answer that, 100 feet more what?
I'm assuming you want us to solve for the unknown variable z

Combine like terms on the right side

Use the distributive property on the left side

Add both sides by 20 to cancel out the "-20" on the left side

Divide both sides by 10

That is the value of the known variable, z, in this equation. Let me know if you need any clarifications, thanks!
~ Padoru
ANSWER

EXPLANATION
The given expression is

The middle radical contains a perfect square.



Note that:

