Question

please answr the question​

Answer 1

Answer:

21.let x=0.4777.......(1)

multiply equation (1)with 100

100x=0.4777*100

= 47.77.......(2)

subtract (2)from (1)

100x=47.77

X=0. 4777

_________

99x=47.293

x=47.293/99

x=0.4777070 bar

22.(100+4)(100-4)=(100)²-(4)²

=10000-16

=9984

(102)3

(102)3 = (100 + 2)3

= (100)3 + (2)3 + 3(100)(2)(100 + 2)

(| Using identity (a+b)^3)

= 1000000 + 8 + 600(100 + 2)

= 1000000 + 8 + 60000 + 1200

=1061208