write a linear function in the form y = mx + b to model the weight of the propane tank over time , where x is the number of week and y is the weight of the tank. assume constant propane use

In the figure below, segment ac is congruent to segment ab: which statement is used to prove that angle abd is congruent to angle acd? a.)triangle acd is similar to triangle abd. b.)triangle acd is congruent to triangle abd. c.)segment a.d. is congruent to segment ac. d.)segment a.d. is congruent to segment dc.