Two equations are shown:
2 answers:
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Answer:
51
Step-by-step explanation:
A = Surface area of the Earth =
Total number of people on Earth = 7.594 billion as of 2018 =
We need to find the number of people living in each square km of land area.
So, we need to divide the number of people by the land area of the Earth.
So, 51 people will inhabit each square km of land area.
Answer:
see explanation
Step-by-step explanation:
Given that z² is directly proportional to w then the equation relating them is
z² = kw ← k is the constant of proportion
To find k use the condition z = 4 when w = 8, thus
4² = 8k
16 = 8k ( divide both sides by 8 )
2 = k
(i)
z² = 2w ← equation of proportion
(ii)
When w = 18, then
z² = 2 × 18 = 36 ( take the square root of both sides )
z = = 6
(iii)
When z = 5 , then
5² = 2w
25 = 2w ( divide both sides by 2 )
w = 12.5