Home
Class 9
MATHS
If 10^(2y)=\ 25\ , then 10^(-y) equals ...

If `10^(2y)=\ 25\ ,` then `10^(-y)` equals
(a)`-1/5`
(b) `1/(50)`
(c) `1/(625)`
(d) `1/5`

Text Solution

AI Generated Solution

Promotional Banner

Topper's Solved these Questions

  • COORDINATE GEOMETRY

    RD SHARMA ENGLISH|Exercise All Questions|23 Videos

  • FACTORIZATION OF ALGEBRAIC EXPRESSIONS

    RD SHARMA ENGLISH|Exercise All Questions|226 Videos

Similar Questions

Explore conceptually related problems

If sqrt(5^n)=125 , then 5^(root(n)64 )= (a) 25 (b) 1/(125) (c) 625 (d) 1/5

1.04 as an improper fraction is (a) 1 1/5 (b) 1 2/5 (c) 1 1/(25) (d) 1 2/(25)

(1/5)^0 is equal to (a)0 (b) 1/5 (c) \ 1 (d) 5

If xdy=ydx+y^2dy and y(1)=1 , then y(-3) is equal to (A) 1 (B) 5 (C) 4 (D) 3

sin{2\ cos^(-1)(-3/5)} is equal to (a) 6//25 (b) 24//25 (c) 4//5 (d) -24//25

If a=-2 , b=-1 ,then a^(b)-b^(a) is equal to a) -1 b) 0.5 c) -2 d) -1.5

If y=sqrt(sinx+y) , then (dy)/(dx) equals (a) (cosx)/(2y-1) (b) (cosx)/(1-2y) (c) (sinx)/(1-2y) (d) (sinx)/(2y-1)

The fraction equivalent to 1 2/3 is (a) (10)/3 (b) 3/5 (c) (10)/6 (d) 6/(10)

Ifint(dx)/((x+2)(x^2+1))=aln(1+x^2)+btan^(-1)x+1/5ln|x+2|+C Then (a) a=1/(10),b=-2/5 (b) a=1/(10), b=-2/5 (c) a=-1/(10),b=2/5 (d) a=1/(10),b=2/5

If A and B are events such that P(B) = 3/5 , P(A//B) =1/2 and P(A cup B) =4/5 , then P(A) equals a) 1/2 b) 1/5 c) 1/3 d) 3/5

RD SHARMA ENGLISH-EXPONENTS OF REAL NUMBER-All Questions
  1. The value of {2-3(2-3)^3}^3 is (a)5 (b) 125 (c) 1/5 (d) -12...

    Text Solution

    |

  2. Which one is the correct option (256)^(0. 16)xx(256)^(0. 09)=? a. 4...

    Text Solution

    |

  3. If 10^(2y)=\ 25\ , then 10^(-y) equals (a)-1/5 (b) 1/(50) (c)...

    Text Solution

    |

  4. The value of x-y^(x-y) when x=2 and y=-2 is (a)18 (b) -18\ (c...

    Text Solution

    |

  5. The product of the square root of x with the cube root of x is (a) cub...

    Text Solution

    |

  6. if 9^(x+2)=240+9^x , then x= (a)0. 5 (b) 0.2 (c) 0.4 (d) 0.1

    Text Solution

    |

  7. The seventh root of x divided by the eighth root of x is (a)x (b) ...

    Text Solution

    |

  8. The square root of 64 divided by the cube root of 64 is (a)64 (b...

    Text Solution

    |

  9. Which of the following is (are) not equal to {(5/6)^(1/5)}^(-1/6)\ ? ...

    Text Solution

    |

  10. When simplified (x^(-1)+y^(-1))^(-1) is equal to (a)\ x y (b) x+y...

    Text Solution

    |

  11. If 8^(x+1)=64 , what is the value of 3^(2x+1) ? (a)1 (b) 3 (c) 9 ...

    Text Solution

    |

  12. If 0 < y < x , which statement must be true? (a) sqrt(x)-\ sqrt(y)=\ ...

    Text Solution

    |

  13. If x is a positive real number and x^2=2, then x^3= (a)sqrt(2) (...

    Text Solution

    |

  14. If (2^3)^2=4^x ,\ then 3^x= (a)3 (b) 6 (c) 9 (d) 27

    Text Solution

    |

  15. If 10^x=64 , what is the value of 10^(x/2+1) ? (a) 18 (b) 42 (c) ...

    Text Solution

    |

  16. If x/(x^(1. 5)\ )=8x^(-1) and x >0, then x= (a)(sqrt(2))/4 (b) 2...

    Text Solution

    |

  17. If g=t^(2/3)+\ 4t^(-1/2) , what is the value of g when t=64 ? ( a)...

    Text Solution

    |

  18. If x^(-2)=64 , then x^(1/3)+\ x^0= (a) 2 (b) 3 (c) 3/2 (d) 2...

    Text Solution

    |

  19. If 4^x-\ 4^(x-1)=24 , then (2x)^x equals (a)5sqrt(5) (b) sqrt(5) ...

    Text Solution

    |

  20. When simplified (-1/(27))^(-2/3) is (a) 9 (b) -9 (c) 1/9 (...

    Text Solution

    |