Answer:
A
Step-by-step explanation:
Length : 
Perimeter: 
Perimeter = 2(Length + Width)
15x + 17y = 2(
+ Width)
15x + 17y = 7x + 14y + 2(Width)
15x + 17y -7x -14y = 2(Width)
8x + 3y = 2(Width)
Width = 
Width = 4x + 3y/2
3.48 x 10^ -5
move the decimal point back to the first number that isn't zero, if the decimal is moved right 5 spaces, it will be 10^ -5 , if a number has a zero, such as 0.000104, it would be 1.04 x 10^ -4.