exam Maths Puzzle Numerical Ability

For the following function, C computes the cost in millions of dollars of implementing a city recycling project when x percent of the citizens participate.
C(x) = 1.4x/(100-x)

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exam Other Question

An airplane covered 24 miles of its route while decreasing its altitude by 36,000 feet. Find the slope of the airplane's line of descent. Round to the nearest hundredth. [Hint: If the diameter of a sphere is doubled, its surface becomes
A. doubled the orginal surface
B.four times the orginal surface
C.eight times the orginal surface
D. three times the orginal surface