Explain how the identity property in the problem 2/3 (1) = 1 (2/3) = 2/3 is the same with any rational number

Which one ? is the answer and how to find this answer

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

On a cm grid, point p has coordinates (3,-1) and point q has coordinates (-5,6) calculate the shortest distance between p and q give your answer to 1 decimal place