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svetoff [14.1K]
3 years ago
10

A sidewalk around a circular park covers a distance of 65 meters. A new sidewalk is being constructed across the park through it

s center. About how long will the new sidewalk be? Use 3.14 for π. Round to the nearest meter.
Mathematics
1 answer:
Paha777 [63]3 years ago
4 0

Answer:


21 m


Step-by-step explanation:


Circumference of circular park = 2πr


65 = 2πr


Solve this to find r:


65 = 2 x 3.14 x r


r = 65 / 6.28


r = 10.35


Now to find the find the distance of the new sidewalk, multiply r with 2 (to get the diameter):


2 x 10.35 = 20.7 ≈ 21 m


Therefore, the distance of new side walk, rounded to the nearest meter, is 21 m.

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Evaluate the indicated limit algebraically. Change the form of the function where necessary. Please write clearly with descripti
alukav5142 [94]

Answer:

\displaystyle \lim_{x\to \infty}\frac{3x^2+4.5}{x^2-1.5}=3

Step-by-step explanation:

We want to evaluate the limit:

\displaystyle \lim_{x\to \infty}\frac{3x^2+4.5}{x^2-1.5}

To do so, we can divide everything by <em>x</em>². So:

=\displaystyle \lim_{x\to \infty}\frac{3+4.5/x^2}{1-1.5/x^2}

Now, we can apply direct substitution:

\Rightarrow \displaystyle \frac{3+4.5/(\infty)^2}{1-1.5/(\infty)^2}

Any constant value over infinity tends towards 0. Therefore:

\displaystyle =\frac{3+0}{1+0}=\frac{3}{1}=3

Hence:

\displaystyle \lim_{x\to \infty}\frac{3x^2+4.5}{x^2-1.5}=3

Alternatively, we can simply consider the biggest term of the numerator and the denominator. The term with the strongest influence in the numerator is 3<em>x</em>²<em>, </em>and in the denominator it is <em>x</em>². So:

\displaystyle \Rightarrow \lim_{x\to\infty}\frac{3x^2}{x^2}

Simplify:

\displaystyle =\lim_{x\to\infty}3=3

The limit of a constant is simply the constant.

We acquire the same answer.

6 0
3 years ago
A restaurant customer left 1.65 as a tip the tax was 7% and the tip was 15% of the after tax cost which information is not neede
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Answer:

D. All of this information is needed to solve the problem

Thank you

4 0
3 years ago
Find the coordinates of the vertex of the following parabola algebraically. Write your answer as an (x,y)(x,y) point.
Archy [21]

Answer:

The coordinates of the vertex are (4 , 16)

Step-by-step explanation:

The coordinates of the vertex of a parabola which represents a quadratic equation y = ax² + bx + c are (h , k), where

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  • k is the value of y at x = h

∵ The equation of the parabola is y = - x² + 8x

- Compare it by the form of the equation above to find a, b and c

∵ a is the coefficient of x²

∴ a = -1

∵ b is the coefficient of x

∴ b = 8

∵ c is the numerical term

∴ c = 0

The vertex of the parabola is (h , k)

∵ h = \frac{-b}{2a}

- Substitute the values of a and b

∴ h = \frac{-8}{2(-1)}=\frac{-8}{-2}

∴ h = 4

∵ k = y at x = h

- Substitute x by 4 and y by k in the equation

∵ k = - (4)² + 8(4)

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5 0
4 years ago
Factorise the following : ​
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Answer:

(3x+4b)(a-2y)

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4 0
3 years ago
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Dvinal [7]
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Let us assume the price at which the shopkeeper bought the chair = x
Then
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9x/10 = 1440 rupees
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x = 14400/9 rupees
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So the price at which the shopkeeper bought the chair was 1600 rupees. I hope the procedure is clear enough for you to inderstand.
5 0
3 years ago
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