A regular decagon is mapped onto itself every time it is rotated

1 answer:

4 0

Not sure if this is true or false but if you rotate the decagon 45 degrees it is mapped onto itself every time. So if this is true or false it is true.

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the sum of two numbers is 70. the larger number is five less than twice the smaller number . what are the two numbers

earnstyle [38]

X+y=70
x=2y-5
x=larger number
y=smaller number
now plug in the value of x to only have one variable in the equation...
Way to solve for y:
(2y-5)+y=70
3y-5=70
add 5 on both sides...
3y=75
divide by 3 on both sides
y=25
1st way to solve for x:
now plug in y in the original equation...
x+25=70
subtract 25 on both sides...
x=45
2nd way to solve for x:
plug in y for the second equation...
x=25(2)-5
x=50-5
x=45
answer: the two numbers are 45 and 25.

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3 years ago

Sin(a+b).cos(a-b) = sinacosa + sinbcosb

Rainbow [258]

Sin (A + B) = sin A cos B + cos A Sin B
Cos (A - B) = cos A cos B + sin A sin B 

=> (SinACosB+ CosASinB) (CosACosB +SinASinB) 

=>SinACosACos^2B+Sin^2ACosBSinB+Cos^2A... 

=>SinACosA(Cos^2B+Sin^2B) +SinBCosB(Sin^2A+Cos^2A) 
we know that Sin^2+Cos^2=1 
=>SinACosA(1)+SinBCosB(1) 
=SinACosA+SinBCosB 
Proved

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Question is in picture

Maslowich

Step-by-step explanation:

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What is the value of x? 4 8 6 10

dsp73

Answer:

The right answer for the question is 6.

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Equation of slope? can it go both ways?

liraira [26]

Answer:

yes

Step-by-step explanation:

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