In 2020, NASA plans to build a space station and launch pad on the moon, with a long-term goal of sending humans to Mars. Why would it be more desire able to launch a spacecraft from the moon instead of Earth?

It is more desirable to laugh a spacecraft from the moon because of the lower amount of gravity affecting the spacecraft and the easier take off because of the lack of heat transfer while leaving the moons “atmosphere” (the moon does not have one and therefor the spacecraft would not lose heat by exiting or entering the moon)

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].