What should be added to 3x2 + xy +3y2 to obtain 4x2 +6xy ?
(1) x2 + 5xy – 3y2
(2) x2–5xy – 3y2
(3) x2 + 5xy + 3y?
(4) x2 +6xy – 3y?​

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.