A triangle has a perimeter of 48" and the dimensions of each side are given as x+3 4x-1 2x-3

48" means 48 inches

anyway

the perimiter is the distance around or the sum of the sides

perimiter=48=x+3+4x-1+2x-3=7x-1

48=7x-1

add 1 to both sides

49=7x

divide both sides by 7

7=x

x+3=7+3=10

4x-1=4 (7) - 1=28-1=27

2x-3=2 (7) - 3=14-3=11

the sides are 10", 27" and 11"

x=7