The price of the tennis racket was estimated to be 200 dollars. However, the actual prin of the tennis racket was 400 dollars What is the percent error?

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)

Kelli swam upstream for some distance in a hour.she then swam downstream the same river for the same distance in only 6 minutes.if the river flows at 5km/hr, how fast can kelli swim in still water?

Write the point slope form of the equation of the line passing through the points (-5, 6) and (0.1).