Answer:
D = 4s
Step-by-step explanation:
Given that D varies directly as s then the equation relating them is
D = ks ← k is the constant of variation
To find k use the condition D = 140 when s = 35
k = [tex]\frac{D}{s}[/tex] = [tex]\frac{140}{35}[/tex] = 4
D = 4s ← equation of variation
