What is the value of x?

Which of the choices shown could be used to prove that aacp=abcp ?

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.

X^2/100+y^2/25=1 the length of the major axis is: a)5 b)10 c)20