If a1=10 and an=-4an-1 then find the value of a4

Which statements about these triangles is true

Which point has an coordinates of (2,0) ? a

Which is a logical conclusion based on the given information? a. figure abcd is a rhombus by the definition of a rhombus. b. segment ac is congruent to segment dc by cpctc. c. angle acb is congruent to angle adc by the angle-side-angle theorem. d. triangle acd is congruent to triangle cab by the hypotenuse-leg theorem.