–81, 108, –144, 192,
which formula can be used to describe the sequence?
a. f(x) = –81(4/3)^x-1
b. f(x) = –81(-3/4)^x-1
c. f(x) = –81(-4/3)^x-1
d. f(x) = –81(3/4)^x-1

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.