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Agata [3.3K]
3 years ago
7

Is 7.8 a rational number

Mathematics
2 answers:
Zigmanuir [339]3 years ago
7 0
Yes, any number that can be represented as a ratio of two integers is rational...

7.8

7 8/10

78/10

39/5

You can also be aware that any terminating number (including terminating decimals) or any number with a repeating decimal pattern is rational.
Helga [31]3 years ago
4 0
Yes, it is. Because you can write it in the form of p/q as
78/10
= 39/5
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Sin5A/SinA-cos5A/cosA=4cos2A​
irina1246 [14]

Answer:

See Explanation

Step-by-step explanation:

\frac{ \sin5A}{\sin A}  -  \frac{ \cos5A}{\cos A}  = 4\cos2A \\  \\ LHS = \frac{ \sin5A}{\sin A}  -  \frac{ \cos5A}{\cos A}   \\  \\  =  \frac{ \sin5A \:\cos A -  \cos5A \:  \sin A}{\sin A \:\cos A }  \\  \\  =  \frac{ \sin(5A -A )}{\sin A \:\cos A}  \\  \\ =  \frac{ \sin 4A}{\sin A \:\cos A}  \\  \\ =  \frac{ 2\sin 2A \: \cos 2A}{\sin A \:\cos A}  \\  \\ =  \frac{ 2 \times 2\sin A \: \cos A \: \cos 2A}{\sin A \:\cos A}  \\  \\ =  \frac{ 4\sin A \: \cos A \: \cos 2A}{\sin A \:\cos A}  \\  \\ =4\cos 2A \\  \\  = RHS \\  \\ thus \\  \\  \frac{ \sin5A}{\sin A}  -  \frac{ \cos5A}{\cos A}  = 4\cos2A \\  \\ hence \: proved

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Three friends collected aluminum cans from the neighborhood to recycle in total they receive 300 cans many collected 90 Jim coll
spin [16.1K]

Given

Total cans = 300

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Jim =100

Bob=110

Now their percentage

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\begin{gathered} manny=\frac{90}{300}\times100\text{ \%} \\  \\ Manny\text{ percentage=}\frac{90}{3}\text{ \%} \\  \\ Manny\text{ percentage =30  \%} \end{gathered}

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\begin{gathered} Jim=\frac{100}{300}\times100\text{ \%} \\ Jim\text{ percentage=}\frac{1}{3}\times100\text{  \%} \\ Jim\text{ percentage=33.333\%} \end{gathered}

Bob percentage

undefined

6 0
1 year ago
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