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
17
12-2n= -72n = 19n = 9.5
to triple a number that was decreased by five you subtract 5 and then multiply by three. for example if you where given 10 you would 12-5=7 -> 7*3=21
"decreased by" means "minus" 12 decreased by z means 12 - z It really is that simple.
To express "12 decreased by some number," you can use the mathematical expression (12 - x), where (x) represents the unknown number. This expression indicates that you start with 12 and subtract the value of (x) from it. The result will vary depending on the specific value of (x).
12
16
It is: 12 ≤ N - 7
16
12
Let the number be x 12-2x = -7 -2x = -7-12 -2x = -19 x = 9.5
17
How about: 18-6 = 12 and 2*12 = 24
x-5>=7 x>=12
12-2n= -72n = 19n = 9.5
to triple a number that was decreased by five you subtract 5 and then multiply by three. for example if you where given 10 you would 12-5=7 -> 7*3=21