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Answer:
Ans 12
1. square root of 1.69 is 1.3
2.square root of 33.64 is 5.8(approx)
3. square root of 156.25 is 12.5
4. square root of 75.65 is 8.7
5. square root of 9.8596 is 3.14
6.square root of 10.0486 is 3.2 (approx)
7.square root of 1.0816 is 1.04
8.square root of 0.2916 is 0.54
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ans 13 22050 should be divided by 2 to attain 11025 which is a square of 105
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ans 14 In is this number: 60. The last digit is 0. Is 0 in the list of numbers that are never perfect squares (2, 3, 7 or 8)?
NO, 0 is not in the list of numbers that are never perfect squares.
Split the number up and add each digit together:
6 + 0 = 6
So now we know the digital root of 60 is 6. Is 6 in the list of digital roots that are always a square root (1, 4, 7 or 9)
NO, 6 is not in the list of digital roots that are always perfect squares. We can conclude that 60 IS NOT a perfect square and we don't need to factor!
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ans 15 let x and y are two numbers ,
product of two numbers = 2475
xy = 2475
x = 2475 / y ----( 1 )
quotient = 11/9
x / y = 11/ 9
( 2475 / y ) / y = 11/ 9 [ from ( 1 ) ]
2475 / y² = 11 / 9
( 2475 × 9 ) / 11 = y²
225 × 9 = y²
y = √ ( 225 × 9 )
= √ ( 15 × 15 ) × ( 3 × 3 )
= 15 × 3
y = 45
put y = 45 in equation ( 1 ) , we get x value
x = 2475 / 45
x = 55
Therefore ,
required two numbers are x = 55 and y = 45
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I hope this helps you
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