I want help ,i want an answer

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b