exam Maths Puzzle Numerical Ability

In 1975 the population of the Earth was approximately 4 billion and doubling every 35 years. The formula for the population P in year Y for this doubling rate is
P (in billions) =

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exam Other Question
Write an equation of the line containing the specified point (-3,7) and perpendicular to the indicated line y=5 show that each number can be written as the ratio of two intergers.
-3.5