What’s the missing length of the side of the rectangle? the area is 7,912 other side of the rectangle is 86ft

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

Aplot of land has been surveyed for a new housing development with borders ab, bc, dc, and da. the plot of land is a right trapezoid with a height of 60 feet and an opposite leg length of 65 feet

What is perpendicular to y=-1/2x+11