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Irina-Kira [14]
3 years ago
12

Find the arc length of the curve on the given interval. Parametric Equations Interval x = 6t + 5, y = 7 − 5t −1 ≤ t ≤ 3

Mathematics
1 answer:
laiz [17]3 years ago
8 0

Answer:

31.241

Step-by-step explanation:

x = 6t + 5,   y = 7 − 5t            −1 ≤ t ≤ 3

dx/dt = 6

dy/dt = -5

The arc length of the curve can be calculated below as

L = ∫\sqrt{(\frac{dx}{dt} )^2 + (\frac{dy}{dt})^2  dt }

 = \int\limits^3_ {-1} \, \sqrt{36 + 25 dt}

 = \sqrt{61} \int\limits^3_ {-1} \, dt

 = \sqrt{61} [3-(-1)]

= 4\sqrt{61}  = 31.241

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<em><u>Solution:</u></em>

Let "a" be the number of shirts sold

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<em><u>Sarah sold a total of 178 t shirts and posters at a festival</u></em>

Therefore,

number of shirts sold + number of posters sold = 178

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<em><u>She sold 46 more tshirts than poster</u></em>

Number of shirts sold = 46 + number of posters sold

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<em><u>Substitute eqn 2 in eqn 1</u></em>

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Step-by-step explanation:

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