Answer:
4/5
Step-by-step explanation:
3,989.237
A thousandth = 1/1000 = 0.001
Round 4th decimal place = 5
5 and over is rounding up and under 5 rounds down so it would be 3,989.237
<h3>
System of equations.</h3>

Put (1) to (2):

Substitute the value of x to (1):

Solution:

C = 9 m the perimeter is all the sides added together you have 9 +8 that is 17 add another 9 and that equals 26 which is the perimeter.<span />