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"decreased by" means "minus" 12 decreased by z means 12 - z It really is that simple.
Well, darling, the algebraic expression for 12 divided by a number is simply 12/x, where x represents the unknown number you're dividing 12 by. So, there you have it, sweetie, 12 divided by a number is written as 12/x. Math made sassy!
12
Let the unknown number be x and so the expression is: x+12
16
That depends on what the number is which you are decreasing by. It is a number less than or equal to 12. Beyond that nothing more can be said without further information.
It is: 12 ≤ N - 7
16
x + 12. If the unknown number is represented by x, the expression for a number increased by 12 would be x + 12.
12/x
n × 12
-(n/12)