PLEASE ANSWER ASAP ( -2) + (+8) =
( -9) + ( -7) =
( -4) + ( -9) =
(-7) + (+7) =

Quadrilateral abcd in the figure below represents a scaled-down model of a walkway around a historic site. quadrilateral efgh represents the actual walkway. abcd is similar to efgh. what is the total length, in feet of the actual walkway?

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

The function v(r)=4/3pir^3 can be used to find the volume of air inside a basketball given its radius. what does v(r) represent