Square deck has an area of 300 square feet, how long is each side?

Since it is a square each side must be equal in length so the length and width have the same measurements...

length x width=area so in this case area divided by two would equal length and width

300 divided by 2 equals 150 so each side is 150 square feet

a reflection across the x-axis , followed by the by a reflection across the y-axis , and then a scale dilation of 0.5 .