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Answer:
Q.21). The base in 5^7 is 5.
Q.22). The exponent in (-8)^3 is 3.
Q.23). The square of 9 is 81. (9^2= 9×9)
Q.24). The cubes of -10 is -1000.
Q.25). (3)^4 is greater than (4)^3
(3)^4= [3×3×3×3]=81
(4)^3= [4×4×4]=64
81 is greater than 64 .
Q.26) The coefficient of a in 4ab is 4.