3 years ago

How many reflectional symmetries does a regular decagon have ?

Mathematics

2 answers:

blagie [28]3 years ago

7 0

I believe the answer is 5

pentagon [3]3 years ago

6 0

The answer to this is ten.

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Please answer a and b

Assoli18 [71]

Answer:

(-2,1) (-1,1),(0,1)

Step-by-step explanation:

find the gradient first

6 0

2 years ago

If 2^(x+3) - 2x = k(2^x) what is the value of k

svlad2 [7]

Answer:

$\large\boxed{C)\ 7}$

Step-by-step explanation:

Use:

$a^n\cdot a^m=a^{n+m}$

$2^{x+3}-2^x=2^x\cdot2^3-2^x=8\cdot2^x-2^x=(8-1)\cdot2^x=7\cdot2^x\\\\2^{x+3}-2^x=k(2^x)\\\\7\cdot2^x=k(2^x)\Rightarrow k=7$

$8\cdot2^x-2^x=8\cdot2^x-1\cdot2^x=(8-1)(2^x)=7\cdot2^x\\\\\text{distributive property:}\ a(b-c)=ab-ac$

8 0

3 years ago

-x+268=57 solve for x

Sergeeva-Olga [200]

Your answer would be x =211

7 0

2 years ago

The Hamid family installed a cylindrical pool in their backyard. The

Alex787 [66]

Answer:

4,046.4 ft^{2}

Step-by-step explanation:

4 0

2 years ago

Evaluate the following integral in cylindrical coordinates triple integral 1/(1+x^2+y^2) dzdxdy z=0..2 y=0..square root(1-x^2) x

sertanlavr [38]

In cylindrical coordinates, we take

$x=r\cos\theta$

$y=r\sin\theta$

$z=z$

so that $\mathrm dx\,\mathrm dy\,\mathrm dz=r\,\mathrm dr\,\mathrm d\theta\,\mathrm dz$ .

We have

$1+x^2+y^2=1+r^2$

and the integral is

$\displaystyle\int_0^2\int_0^\pi\int_0^1\frac r{1+r^2}\,\mathrm dr\,\mathrm d\theta\,\mathrm dz=\frac{\ln2}2\int_0^2\int_0^\pi\mathrm d\theta\,\mathrm dz=\boxed{\pi\ln2}$

8 0

2 years ago