solve question 21,22,23 by step by step
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Step-by-step explanation:
21.
8^3=512 so cube root of 512=8
10^3=1000 so cube root of 1000 is 10
6^3=216 so cube root of 216 is 6
9^3=729 so cube riot of 729 is 9
substituting all the values
(8-10)/(6+9)
=-2/15
22.
10^-5 can be written as 2^-5*5^-5
225 as 15*15
6^-4 as 2^-4*3^-4
substitute in the question
(3^-6)*(2^-5)*(5^-5)*(3*5)*(3*5)/(5^-7)*(2^-4*3^-4)
now by using the algebric rules
a^m/a^n=a^(m-n)
a^m*a^n=a^(m+n)
(3^(-6+2+4))*(2^(-5+4))*(5^(-5+2+7))
=(3^0)*(2^-1)*(5^4)
=1*625/2
625/2=312.5
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