How do you find the unknown length, x, for the similar triangle

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?

Is the power produced directly proportional to the wind speed, give reasons for your answer?

How do i multiply two digit numbers