I need HELp with number 3 and 4, can you also explain how you got it so I can practice for my self?

In the figure below, segment ac is congruent to segment ab: triangle abc with a segment joining vertex a to point d on side bc. side ab is congruent to side ac which statement is used to prove that angle abd is congruent to angle acd? segment ad bisects angle cab. triangle acd is similar to triangle abd. segment ad is congruent to segment ac. angle cab is congruent to angle cba.

Describe a situation that you could represent with the inequality x< 17

Which expression is rational? 6. , square root two, square root 14, square root 49