Multiple choice! all of the following are features to consider when selecting equipment except: size cleaning can be difficult cost safety

Size, cost, and safety are things to consider. 

"Cleaning can be difficult" is not a sufficient reason to not buy something. It can be a factor, but everything else is to be taken with much more consideration.

I hope this helps!
~kaikers

This is a pretty on point question because all we need to do is replace 's' in the equation with '35'.the calculation will be9.95 + 0.30s = c9.95 + 0.30 (35) = c9.95 + 10.5  = cc = 20.45