9x - 6 = 9x + h

help pls

Which of the following can be used to explain a statement in a geometric proof?

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

Alina fully simplifies this polynomial and then writes it in standard form. xy2 – 2x2y + 3y3 – 6x2y + 4xy2 if alina wrote the last term as 3y3, which must be the first term of her polynomial in standard form? xy2 5xy2 –8x2y –2x2y