4w-7k=28
-7k=-4w+28
k=4/7w-4
Answer:
x = 33.6
Step-by-step explanation:
Formula to be used for the scale factor,
Scale factor =
From the figure attached,
Side length of the big triangle = x
Corresponding side length of small triangle = 28
Scale factor = 

x = 
x = 33.6
Answer: 8 %
Step-by-step explanation:
SI = prt / 100
640 = 8000 x r x 1
r = 640 / 8000 = 0.08