Help me to solve chart

Here,

the given expression is:

3x-15

when x=1

then

=3×1-15

=3-15

=-12

when x=2

then

=3×2-15

=6-15

=9

when x=3

then

=3×3-15

=9-15

=6

the value of x in expression 3x-15 is -12,9 and 6.

1 =     (3 x 1) - 15

2=      (3 x 2)- 15

3=       (3 x 3)- 15

Step-by-step explanation:

1=    -12

2=    9

3=    6

hi, i am not sure about this one but i think its d,

hope this !