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1. sorry it was hard but i will try

   Step-by-step explanation:

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2. The constant of proportionality is [tex]\frac{9}{2}[/tex]

   Step-by-step explanation:

   The constant of proportionality is the ratio between two directly proportional quantities

   If x and y are in directly proportion, then [tex]\frac{y}{x}=k[/tex] , where k is the constant of proportionality.The direct proportion can be represented by a line whose equation is y = kx, where k is the slope of the line.

   To find the constant of proportionality from the given graph choose a point on the line and substitute x and y in the equation of the proportionality by the coordinates of the point.

   ∵ Point (4, 18) lies on the line

   ∴ x = 4, y = 18

   ∵ The equation is y = kx

   → Substitute x by 4 and y by 18

   ∴ 18 = k(4)

   ∴ 18 = 4k

   → Divide both sides by 4 to find k

   ∴ [tex]\frac{18}{4}=\frac{4k}{4}[/tex]

   ∴ [tex]\frac{18}{4}=k[/tex]

   → Simplify the fraction by dividing up and down by 2

   ∴ [tex]\frac{9}{2}=k[/tex]

   ∴ The constant of proportionality is [tex]\frac{9}{2}[/tex]

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3. Probably the sentence “They needed ways to move around in the city.

   Explanation: The paragraph would be fine without the sentence.

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4. The trend quickened after 1860 and continued throughout the 21st century as well.

   Explanation:

   this one because you are telling the same thing basically with the whole article and the last sentence.

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