12, 8, 18, what is the value of x

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?

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

Rewrite the expression in z to the n power. the expression i was given is: 1 over z to the negative 1 half power.