20+2x
40
49+2x
6
There is no selected number so it would be a variable. The answer is 2n-9 (n is the number which you choose)
20+2x
40
49+2x
6
15
2X + 3
There are two possible (and different) answers: 2x + 3y = 12 or 2*(x + 3y)= 12 The first one is (twice a number) increased by (three times another) The second is twice (a number increased by (three times another)).
18
There is no selected number so it would be a variable. The answer is 2n-9 (n is the number which you choose)
Let the number be x and so the expression is: 2x+3
16
2x+3