Estimate the difference 422 - 284

How do you use the additive inverse to evaluate an expression that uses subtraction in a full sentence

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 spreadsheet would be used to compute the first nine terms of the geometric sequence a^n=32•(1/2)n-1