HEELLLPPP I need help and I don't have a lot of time left!!

Is fgh ~ jkl? if so, identify the similarity postulate or theorem that applies.

Follow these steps using the algebra tiles to solve the equation −5x + (−2) = −2x + 4. 1. add 5 positive x-tiles to both sides and create zero pairs. 2. add 4 negative unit tiles to both sides and create zero pairs. 3. divide the unit tiles evenly among the x-tiles. x =

How do you write something in scientific notation?