Find the total surface area of the figure below

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

How do you use the elimination method for this question? explain, because i really want to understand!

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 =