RULEMATH | MATH ONLINE/DIRECT CLASS | MATH WEBSITE | SCIENCE CLASS 10, PHYSICS CLASS 11 AND 12

 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

1ANSWERS TO MATH CONNECT, ENGLISH CONNECT, தமிழ் கனெக்ட் EDITION 14 . Find 79² - 21² without full calculation. (79+21)(79-21)=(100)(58)=5800  2. Simplify (225 x 5³ x 2² x 4³)/(3² x 10⁴)      using exponent laws. =5²x 3² x 5³ x 2² x 2⁶)/(3² x 5²x 2²) =5³ x 2⁶=8000  3. Find n if √(512) = n√2 √(256x2)=n√2 16√2=n√2 n=16  4. Simplify 3√2 - 2√3 + 5√2 - 3√3 8√2-5√3  5. Simplify (3x-24)(x²- x - 12)/(x² -5x-24) 3(x-8)(x-4)(x+3)/(x-8)(x+3) =3(x-4)  6. Find (4 x 10⁰ ) + 0.002 + (2 x 10⁻³) +      (40x10⁻³) + (400x10⁻³) 4+.002 + .002 + .04 + 0.4 = 4.444  7. If A:B = 3:5 and B:C = 25:9 then find A:C A/C= (A/B)(B/C)=(3/5)(25/9)=5/3  8. If A:B = 2:7 and C:B =8:3 then find A:B:C  A:B = 2:7 and B:C =3:8 A:B = 2x3 :7x3 and B:C =3x7 : 8x7 A:B:C = 6:21:56  9. Simplify 3a - (2a +3 - 3b) - (4b - 3c +3a) + 5a +12 and find the value of the expression at a=1, b=2and c = -3.  3a - 2a +3 - 3b- 4b - 3c +3a+ 5a +12  Re...