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4 years ago

GUESS!

Mathematics

1 answer:

galina1969 [7]4 years ago

5 0

The three numbers are 6, 7 and 9

<u>Explanation:</u>

First of all exclude the numbers which aren't correct.

From the 4th data,We can conclude the digit 5, 2 and 3 are wrong.

Now,

147 - One digit is right but wrong placed
189 - One digit is right and placed correctly
964 - Two digits are correct but at wrong place
523 - All digits are wrong
286 - One digit is right but in the wrong place

We've to find the three digits :

From case 4: 5, 2 and 3 are wrong

So, remove 5, 2 and 3 from all the cases

The numbers are:

147 - One digit is right but wrong placed
189 - One digit is right and placed correctly
964 - Two digits are correct but at wrong place
_86 - one digit is right but in the wrong place

From 1st and 3rd we can say that: 4 is present in both the case but wrongly placed.

Now the digits become:

1_7 - One digit is right but wrong placed
189 - One digit is right and placed correctly
96_ - Two digits are correct but at wrong place
_86 - one digit is right but in the wrong place

From 3rd and 4th case we can say that: 9 and 6 are correct but wrongly placed, 8 is not the number and 6 is placed at first

So, the two numbers of a 3 digit number are 6 and 9

From 2nd, 3rd and 4th case, the position of 6 and 9 are:

6 _ 9

From 1st case, 7 is the digit but wrongly placed. So, the 3 digit number becomes:

6 7 9

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If (x^2+1)/x = 7 find x^2+(1/x^2)

White raven [17]

Answer:

x²+(1/x²) = 47

Step-by-step explanation:

by identity : (a+b)² = a²+b²+2ab

(x+1/x)²= x²+(1/x)²+2(x)(1/x)

(x+1/x)²= x²+(1/x²)+2....(1)

since : (x²+1)/x = 7

(x²/x) +(1/x) = 7

x + (1/x )= 7

put the value for : x +(1/x) in (1) :

49 = x²+(1/x²)+2

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Answer:

y=4/3+19/3

Step-by-step explanation:

When it asks for perpendicular it means your focusing on the slope.

Perpendicular means opposite of the current slope, so flip it and change the sign (-3/4 changes to 4/3). Next you will use the equation (y-y1)=m(x-x1)

y1=the y value given

x1=the x value given

m=your slope

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y-1=4/3(x)+4/3(4)

y-1=4/3x+16/3 Now we add the one to both sides.

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$\frac{1}{1} x\frac{3}{3}=\frac{3}{3}$ Now we can add this to the 16/3

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