You walk 3 mi/hr south on a train going 80 mi/hr north. Calculate your overall velocity. I put this in Mathematics because I couldn't find science lol.

1 a)

1 b)    

2 a)

2 b)

Step-by-step explanation:

Given statements:

1. Find the sum of -7g and 4g + 2

2. Find the difference when 6 is subtracted from 2 - 4

a) To write an expression based on the given statement

b) To simplify the expression

Solution:

1) The expression for sum of and  is given as:

1 a)

The above expression can be simplified by combining the like terms:

1 b) ⇒       [ As ]

2) The expression for the  difference when is subtracted from can be given as:

2 a)

The above expression can be simplified by combining the like terms:

2 b) ⇒    [ As ]