Answer:
4
Step-by-step explanation:
2x+19=x+23
We simplify the equation to the form, which is simple to understand
We move all terms containing x to the left and all other terms to the right.
+2x-1x=+23-19
We simplify the left and right sides of the equation.
+1x=+4
We divide both sides of the equation by 1 to get x.
x=4
A and B
1/4x^2 = (1/2x)^2
449pounds
29x15months=435
435+15=449 pounds
P.S. That was one BIG dog.