Nirmql 1 Question 0 Answers 0 Best Answers 20 Points View Profile0 Nirmql Asked: February 7, 2020In: Class 9Power and exponent0Ques.14. if 10 raised to power 2y = 25 then 10 raised to power -y =?class 9class 9mathsimportant questions class 10 mathsmathsmaths mcq ShareFacebook2 AnswersVotedOldestRecentAmit Sharma 13 Questions 59 Answers 11 Best Answers 495 Points View Profile Amit Sharma Added an answer on February 7, 2020 at 3:50 am (10)^2y = 25So,[(10)^y]^2 = 25and(10)^y = square root (25) = 5Therefore,[10]^(-y) = 1/57Reply Share ShareShare on FacebookShare on TwitterShare on LinkedInShare on WhatsApp Shivam Added an answer on February 8, 2020 at 4:22 pm 10^2y =10×10×y=100y 100y=25 Y=25÷100=14 10^-y=-10y^1×14 Y=-10×14=-0.250Reply Share ShareShare on FacebookShare on TwitterShare on LinkedInShare on WhatsAppLeave an answerLeave an answerCancel reply Click on image to update the captcha.Save my name, email, and website in this browser for the next time I comment.

## Amit Sharma

(10)^2y = 25

So,

[(10)^y]^2 = 25

and

(10)^y = square root (25) = 5

Therefore,

[10]^(-y) = 1/5

10^2y =10×10×y=100y

100y=25

Y=25÷100=14

10^-y=-10y^1×14

Y=-10×14=-0.25