Answer:
4.5
Explanation:
The perimeter of a triangle can be found by adding the lengths of the sides of the triangle together.
So if we're given the perimeter of the triangle to be 63 inches and the length of each side to be (4x + 3), we can find the value of x as shown below;
[tex]\begin{gathered} 63=(4x+3)+(4x+3)+(4x+3) \\ 63=3(4x+3) \\ \frac{63}{3}=4x+3 \\ 21=4x+3 \\ 18=4x \\ x=\frac{18}{4}=4.5 \end{gathered}[/tex]