Please answer this question...

What is the standard form of -5x^2+2x^4-11+x^3+3x

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?

Tom travels between the two mile markers shown and then finds his average speed in miles per hour. select the three equations that represent this situation.