There is 1000 mm in one meter....
So..... .9 x 1000 = 900 mm
I would go with d .... If not it would be c...
Really hope I help but I would choose d
You're going to use the substitution method for this.
First, we know that Y = x-7, so we can plug x-7 into everywhere we see Y!
3x - 3(x - 7) = 21
then we simplify
3x - 3x + 21 = 21
^ ^
These cancel out!
So we're left with...
21 = 21
That means that the solution to this equation is all real numbers!
