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Zielflug [23.3K]
3 years ago
15

Prove the divisibility of the following numbers by 7

Mathematics
1 answer:
oee [108]3 years ago
3 0
5^5 mod 7 = 3
5^4 mod 7 = 2
5^3 mod 7 = 6

3 -2 +6 mod 7 = 0
Therefore, 5^5 -5^4 +5^3 mod 7 = 0 and that sum is divisible by 7.
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Statements
vazorg [7]

Answer:

See Explanation

Step-by-step explanation:

The question has unclear information.

So, I'll answer from scratch

Given

ABC = Right angled triangle

DB bisects ABC

Required

Prove that CBD = 45

From the question, we have that:

ABC is right angled at B

So, when DB bisects ABC, it means that DB divides ABC into two equal angles.

i.e.

CBD = ABD

and

CBD + ABD = 90

Substitute CBD for ABD in CBD + ABD = 90

CBD + CBD = 90

2CBD = 90

Divide both sides by 2

\frac{2CBD}{2} = \frac{90}{2}

CBD = \frac{90}{2}

CBD = 45

Hence, it is proved that CBD = 45

<em>Follow the above explanation and use it to answer your question properly</em>

6 0
3 years ago
HELP HELP HELP 100PTS<br> sin(x)= - 0.8. If x and y are complementary, what is cos(y)
Pepsi [2]

Answer:

Step-by-step explanation:

sin (x)=-0.8\\x+y=90\\x=90-y\\sin(90-y)=-0.8\\cos (y)=-0.8\\sin (90-\alpha )=cos\alpha

8 0
3 years ago
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H(x) = x -2<br> g(x) = 2x² – 3x<br> Find h(g(-2))
emmasim [6.3K]

Answer:

h[g(-2)] = 12

Step-by-step explanation:

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kozerog [31]

Answer:

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Step-by-step explanation:

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Five less than twice a number is equivalent to 47
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Answer:

2x - 5 = 47 is the expression .

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Step-by-step explanation:

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3 years ago
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