Answer:
d = 
Step-by-step explanation:
Given that W varies jointly as L and d² then the equation relating them is
W = kLd² ← k is the constant of variation
To find k use the condition W = 140 when d = 4 and L = 54, thus
140 = k × 54 × 4² = 864k ( divide both sides by 864 )
= k , that is
k = 
W =
Ld² ← equation of variation
Multiply both sides by 216
216W = 35Ld² ( divide both sides by 35L )
= d² ( take the square root of both sides )
d = 
Check the picture below, notice those three quadrilaterals, bearing in mind that a square and rhombus both have equal sides all around.
As a fraction is 0.6, as a mixed number 0.6, as a whole number in simplest form is 0.6. Hope this helps.
Answer:
the Answer is c I just had the same problem