Which of the following is one of the most significant reasons cogeneration is not widely used? A.
It is less efficient than conventional methods of producing energy.
B.
Biofuels are new, and people are reluctant to use them.
C.
Thermal energy is not useful like electricity is.
D.
It requires cost-prohibitive equipment upgrades.

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].

Answer mauritania is in the northwestern part of african, meaning its in the western hemisphere, and how do i know/ the map showed me so; ///: )

Do you have a picture for this problem?

The answer to the first one is barometer.