What is the slope of a surface having a rise of 5 feet and a run of 0 feet?

 The slope is "undefined."

Step-by-step explanation:  In math, division by 0 is undefined-- like you can't do it  

For slope, you need to divide rise/run.  If the run is 0, so undefined.

In real life, this surface would be like a wall or a door. They don't have a slope if they're constructed properly!

a) justify

step-by-step explanation:

justifying is just part of everyday life. justify kind of means proof so i think the answer is a) justify.

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540