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Edition 18 math connect

1. If x=5+√3 find (x + (1/x)) and   (x - (1/x)). 2. If a=-30, b=18, c=12 find the value  of a³+b³+c³. 3. What is 25% of 18000? 4.  Rationalise (√5+√2)/(√5-√2). 5. Write 26620 in terms of  powers of its prime factors. 6. Multiply 30ab x 40bc x 50c x 2d. 7. If x = 8⁻¹ x 10⁴ and y = 15⁻¹ x 10⁴ find  the value of (1/x²) + (1/y²). 8. Factorise 4x²-5x-6. 9. Evaluate (199)². 10. Evaluate 23 x 17 using identities. 1. APPRECIATION  2. HUMANITY 3. GRATITUDE  4. MINDFUL  5. RESPECTFUL  1. அலங்காரம்  2. பொன்மொழிகள்  3. மெய்யறிவு  4. நீர்நிலைகள்  5. மதிநுட்பம்  1 . A A E I I N T R P C P O 2. N I M A U Y H T  3. T T I G E A U R D 4. L F I D N U M 5. S E E T P U R C L F  1. அ ம் ங் ர கா ல 2. க பொ ழி ன் ள் மொ 3. றி ய வு ய் மெ  4. லை ள் நீ நி க ர் 5. ம் தி ம ட் ப நு 1. What is 20% of 12000? 2. Rationalise (√3+√2)/(√3-√2) 3. Write 4096 in terms of       powers of its prime factors. 4. If a² +(1/a...
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Answers to Math Connect Edition 5 Questions

 1. 21 2. 500% 3. 197 4. 60 days 5. Rs.42,20 6. 6²² 7. 1/2 8. 24 9 . 50% 10. 2/81
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Math Connect Answers with steps

ANSWERS TO MATH CONNECT ,ENGLISH CONNECT AND TAMIL CONNECT EDITION 17 1. 20x12000/100=2400 2. (√3+√2)(√3+√2)/(√3-√2)(√3+√2) =5+2√6 3. 2^11 4. (a + (1/a))²=a² +(1/a)²+2=23+2=25 5. 6(1+2+3+4+...+100) =6(100)(101)/2 =100x303=30300 6. 120abcd 7. 0.4321 8.3.24÷2 = 1.62 0.0324÷0.2=0.162 9. (75xyz-150yz)/(x-2) =75yz(x-2)/(x-2)= 75yz 10. x=0.5 and y=0.2 x=1/2 and y=1/5 (1/x²) + (1/y²)=2²+5²=4+25=29 1. APPRECIATION  2. HUMANITY 3. GRATITUDE  4. MINDFUL  5. RESPECTFUL  1. அலங்காரம்  2. பொன்மொழிகள்  3. மெய்யறிவு  4. நீர்நிலைகள்  5. மதிநுட்பம்  ANSWERS TO MATH CONNECT EDITION 16 1. (1/x)= 1/(2+√3)= (2-√3)/ (2)²-(√3)²=2-√3 x + (1/x)) = 2+√3+2-√3=4 x - (1/x)).=2+√3-2+√3=2√3 2. a+b+c=-30+20+10=0 Therefore a³+b³+c³=3abc=3(-30)(20)(10)=-18000 3. 264600=2³x3³x5²x7² a=2,b=3,c=5,d=7 4. x=3y/4 x+3=(3y/4)+3=(3/4)(y+4) (x+3)/(y+4)=3/4 5. (1/x²) + (1/y²)=(4/10⁴)² + (3/10⁴)²=25x10⁻⁸ 6.  ab=1/3,bc=3/4,c=4 bx4=3/4 So, b=3/16 a=16/9 ac=64/9 abc=4/3 (1/a) + (1/b) + ...
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Class 10 Biology Control and Coordination Part 1

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   1. Which part of the brain maintains posture and equilibrium of the body?  2. What are plant hormones? 3. Iodine is necessary for the synthesis of ________ hormone. 4. Which part of the human brain controls body temperature? 5. Name two components of central nervous system  in humans. 6. Name the part of the brain concerned with memory. 7. Name the structure in which spinal cord is protected in human body. 8. What is the movement of shoot towards light called? 9. Pituitary gland is also called the master gland. Why? 10. Endocrine glands are called ductless glands. Why? 11. Name the hormone which regulates sugar level in our body.  12. Why adrenaline is known as emergency hormone! 13. What is reflex arc? 14. State the functions of Abscisic acid 15. State the functions of Cytokinin 
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Class 10 Science Board Exam Sample Questions and Answers

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Class 10 Students can go through this as a ready reckoner for their Science Board Examination  All answers are given in blue   1. Fe + ZnSO₄   No reaction takes place as Iron is less reactive than Zinc.  2. What happens when zinc granules is added to freshly prepared ferrous sulphate solution? A greyish black coating is formed. Zinc is more electropositive than iron and so it can displace iron from its solution.  The solution turns colourless from light green. 3. An aqueous solution A turns phenolphthalein solution pink.  On addition of an aqueous solution B to A, the pink colour disappears. What can you say about A and B? A has pH greater than 7 and B has pH less than 7. 4. What happens when ethanol reacts with sodium? Sodium ethoxide is formed  5. What happens when ethanol reacts with potassium permanganate solution? Ethanoic acid 6. Scientific term for studying the development of new types of organisms from the existing ones Evolution  ...
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