Answer:
River C is: 2,965 miles long.
River D is: 2,565 miles long.
Step-by-step explanation:
Have a great day! ^^
3s + 135 = 4.5s + 45
Now move the variables and coefficients
135 = 1.5s + 45
And then the numbers
90 = 1.5s
Simplify
90/1.5 = 1.5s/1.5
60 = s
Hope this helps!