What does it mean to say that scientists are methodical in their work?

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 =

Match the one-to-one functions with their inverse functions.

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.