Which situation is an example of an observation study ?

How many square feet of out door carpet will we need for this hole? 8ft 3ft 12ft 4ft

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 =

This is so hard and it’s for a test