Question

7. Give four rational numbers equivalent to
( I ) -2/7. (ii) 5/-3

8. Find the circumference of the circles with radius 14 cm.

9. Add :
(i) 3mn,-5mn,8mn,-4mn.
(ii) t-8tz,3tz-z,z-1.

10. Using laws of exponents,simplify and write the answer in exponential form :
( I) 3^2 × 3^4 × 3^8
(ii) a^3 × a^2.​

Answer 1

Answer:

here it's your answer bro

Answer 2

7. to get rational no.'s equivalent to anther rational no. all we have to do is to multiply both the numerator and denominator with the same no.

so, Here's how i got the above answer:

5*2/-3*2=10/-6

5*3/-3*3=15/-9

5*4/-3*4=20/-12

5*5/-3*5=25/-15

8. Radius = 14 cm

Circumference = 2πr

=> 2 × 22÷7 × 14

=> 2 × 22 × 2

=> 44 × 2

=> 88 cm.

9.  answer:- ↓↓

(1) The given terms for addition are  3mn,−5mn,8mn,−4mn

=3mn+(−5mn)+8mn+(−4mn)

=3mn−5mn+8mn−4mn

=11mn−9mn

=2mn

(2 )Similarly the given terms for addition operation are t−8tz,3tz−z,z−t

 =(t−8tz)+(3tz−z)+(z−t)

=t−8tz+3tz−z+z−t

=−5tz

10. $3^2 * 3^4 * 3^8$

$using \\a ^m *a ^n =a^ m^+^n$

$=3 ^2^+^4^+^8$

$=3 ^1^4$

hope it helps u :-)