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3 years ago

For every how many degrees will an octagon have rotational symmetry?

Mathematics

2 answers:

vladimir2022 [97]3 years ago

8 0

A: 30 degrees :)))))

RoseWind [281]3 years ago

3 0

OMG SO EASY! A. 30 degrees is the answer

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Write 18% as a fraction

Charra [1.4K]

Hi there!

$18$ % $= \frac{9}{50}$

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3 years ago

Read 2 more answers

What is the same as 2% of 90

sp2606 [1]

Answer:

1.8

Step-by-step explanation:

(2x90):100

180:100 = 1.8

6 0

2 years ago

The rear wheel of a lawn tractor has a 20-inch radius. Find the angle (in radians) through which a wheel rotates in 23 seconds i

Minchanka [31]

Answer:

263.12 radians

Step-by-step explanation:

The length of the rear wheel is given by:

$L=2\pi r\\L=40\pi$

The distance traveled by the lawn tractor in 23 seconds is:

$d=13\frac{miles}{hour} *63360\frac{inch}{miles}*\frac{1\ hour}{3600\ seconds}*23\ seconds\\ d=5,262.4\ inches$

The angle through which a wheel rotates is given by:

$A=\frac{d}{L}*2\pi \\A=\frac{5,262.4}{40\pi}*2\pi\\A=263.12\ radians$

The wheel rotates through a 263.12 radians angle.

8 0

2 years ago

Can someone help (will give brainliest)

nikklg [1K]

Answer:

384

Step-by-step explanation:

8 x 6 = 48

48 x 2 = 96

12 x 10 = 120

6 x 12 = 72

8 x 12 = 96

96 + 120 + 72 +96 = 384

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2 years ago

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Solve for x 4/x + 4/x^2-9= 3/x-3

Goshia [24]

$\dfrac{4}{x}+\dfrac{4}{x^2-9}=\dfrac{3}{x-3}\qquad\text{subtract}\ \dfrac{4}{x^2-9}\ \text{from both sides}\\\\\dfrac{4}{x}=\dfrac{3}{x-3}-\dfrac{4}{x^2-9}\qquad\text{use}\ a^2-b^2=(a-b)(a+b)\\\\\dfrac{4}{x}=\dfrac{3}{x-3}-\dfrac{4}{x^2-3^2}\\\\\dfrac{4}{x}=\dfrac{3}{x-3}-\dfrac{4}{(x-3)(x+3)}\\\\\dfrac{4}{x}=\dfrac{3(x+3)}{(x-3)(x+3)}-\dfrac{4}{(x-3)(x+3)}\qquad\text{use distributive property}\\\\\dfrac{4}{x}=\dfrac{3x+9-4}{(x-3)(x+3)}\\\\\dfrac{4}{x}=\dfrac{3x+5}{x^2-9}\qquad\text{cross multiply}$

$4(x^2-9)=x(3x+5)\qquad\text{use distributive property}\\\\4x^2-36=3x^2+5x\qquad\text{subtract}\ 3x^2\ \text{and}\ 5x\ \text{from both sides}\\\\x^2-5x-36=0\\\\x^2-9x+4x-36=0\\\\x(x-9)+4(x-9)=0\\\\(x-9)(x+4)=0\iff x-9=0\ \vee\ x+4=0\\\\\boxed{x=9\ \vee\ x=-4}$

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3 years ago