Question

answer these questions plz

Answer 1

1) 3/ 5

Multiple it by -7 to get numerator -21

3/5 × -7 = -21/5


2) Multiply by 50 to get 150

3/5 × 50

150/5


Thanks

Answer 2

HI FRIEND,
1)1)4/9=44/99
=4*11/9*11
2)7/-3=35/-15
=7*5/-3*5
3)-3/5=-12/20
-3*4/5*4
HENCE, THIS BIT IS FULL EQUIVALENT BY SHOWING PROOF
2)1)4/9≠16/27
=4*4/9*4
=16/36
(OR)
=4*3/9*3
=12/27
2)-100/3≠300/9
=-100*3/3*3
=-300/9
3)3/-17≠8/-51
THIS PAIR NOT EQUIVALENT BECAUSE , NUMERATORS ARE NOT EQUAL
HENCE , THIS BIT IS NOT EQUIVALENT BY BY SHOWING PROOF
3)1)4/7
=4*1/7*1=4/7
=4*2/7*2=8/14
=4*3/7*3=12/21
2) 36/108=1/3
=1*1/3*1=1/3
=1*2/3*2=2/6
=1*3/3*3=3/9
3)-5/-7=HERE,MINUS WILL CANCELLED=5/7
=5*1/7*1=5/7
=5*2/7*2=10/14
=5*3/7*3=15/21
4)-72/180=-2/5
=-2*1/5*1=-2/5
=-2*2/5*2=-4/10
=-2*3/5*3=-6/15
4)3/5 IN RATIONAL NUMBER BY GIVEN NUMERATOR
1)-21
=3*-7/5*-7
=-21/-35
=21/35
2)150
=3*50/5*50
=150/250
I HOPE THIS HELPS U ALL 
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IF U LIKE
:)