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miss Akunina [59]
3 years ago
14

Ms. Fry started walking as her New Year’s resolution. She calculated that she can walk a 1/2 mile in 1/4 of an hour. What is her

walking rate in miles per hour?
Mathematics
1 answer:
Natalija [7]3 years ago
6 0

Answer:

2 miles per hour

Step-by-step explanation:

1/4 x 4 = 1

1/2 x 4 = 2

1/4 is a quarter of 100, so you have to multiply it by 4 to get 100% or 1.

So 1/2 x 4 is 2, which is the mph.

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The circumference of a circle is 15n cm what is the area of the circle in terms of n
Mice21 [21]

Answer:

Area of circle is \dfrac{225n^{2}}{4\pi} cm^{2}

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Formula for circumference of circle is given as,

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Substituting the value,

15n=2\pi r

Solving above equation for r, divide both side by 2\pi

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Simplifying,

\dfrac{15n}{2\pi}=r

Formula for area of circle is given as,

A=\pi r^{2}

Substituting the value of r,

A=\pi \left(\dfrac{15n}{2\pi}\right)^{2}

Squaring the parenthesis,

A=\pi \left(\dfrac{225n^{2}}{4\pi^{2}}\right)

Cancelling out the common term,

A=\dfrac{225n^{2}}{4\pi}

Therefore, area of circle in terms of n is A=\dfrac{225n^{2}}{4\pi} cm^{2}

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