1. Which is not a possible reason that might have contributed to the development of the slide?
Choose one:
O River erosion may have made the slope unstable.
O Heavy rains may have made the materials heavier and lubricated the slip surface.
O Rock layers were dipping toward the valley, parallel to the slip surface.
O A large housing development was built in the area, making the slope unstable.

Dall of the above all of the choices make sense

Amath expression is a collection of one or more terms, which are separated by the signs ( + , - , x , / ).example :   8+b8+b  or  a−3a−3in algebra, an equation is a mathematical statement with two expressions where, each expression is separated by an equal (=) sign. variables can be present on both the sides of the equality (=) sign and we use letters to denote such variables.example 1:   x=4+2x=4+2  , [here, we can observe that the variable is present only on one side of the equation].example 2:   2x+3=x+42x+3=x+4  , [here, we can observe that the variables are present on both side of the equation].