1) Given 2) their 2 non-common sides in 1 ray 3) definition of: supplemental angles 4) substitution 5) opposite angles are congruent (equal) 6) substitution 7) definition of supplementary angles
The rate of water level change per hour is 1.5 inches per hour. You can find it out easily by dividing the total time by the total level change. Hope this Helps:)
