Hi can someone help please? thank you

What two criteria are needed for triangles to be similar

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?

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.