Question

How would we write an expression to show the number c being subtracted from the sum of a and b?

 Start by writing an expression for "the sum of a and b."
 Now, show c being subtracted from the sum.

Answer 1

a + b - c

Explanation:

Well think about it this way...

PerenthesisExponentsMultiplicationDivisionAddingSubtraction

you can add those with no problem

Answer 2

a + b - c

this is the answer... credit goes to Chris8799 under me he fixed my mistake