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Answer:
9) b) - 1
10) b) 2^6
14) i) 5 ii) - 1
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Step-by-step explanation:
9 -b
10-b
11-
12-
since bases are equal then we can add the powers
(2/7)^(x+x+2)= (2/7)^8
(2/7)^(2x+2)=(2/7)^8
since bases are equal then we can equalize powers
2x+2= 8
2x=8-2=6
x=6/2=3
13) (4^-1 +5^-1 +6^-1)*(2/3)
= (1/4 +1/5 +1/6)*(2/3)
=(15+12+10)/60 *(2/3)
=(37)/60*(2/3)
= 74/30
14)
8m^2-9n = 8*4-9*3= 32-27= 5
m-n = 2-3= -1
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