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.
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
"decreased by" means "minus" 12 decreased by z means 12 - z It really is that simple.