tolong jawabannya semuanya ya secepatnya

1).(9^⅓)^ -6
=(9)^⅓×(-6) *antar pangkat di ×
=(9)^ -2
=(3²)^ -2
=(3)^2×(-2)
=(3)^ -4
=1/3^ 4
=1/81. jawaban D
2).5√5×√48÷√12
=√25×√5×√48÷√12
=√(25×5×48÷12)
=√(125×4)
=√(500)
=√( 100×5)
=10√5 jawaban A
3).12, 20,30,42,56,...
+8+10+12+14
Sn=(n/2)(2a+(n-1)b)
=(n/2)(2.8+(n-1)2)
=n(8+(n-1))
Un=a+S(n-1)
U22=12+S(22-1)
=12+S(21)
=12+(n(8+(n-1))
=12+(21(8+(21-1))
=12+(21(8+20))
=12+(21.28)
=12+(588)=600 jawabanB
4).1,3,5,7
un=a+(n-1)b
u8=1+(8-1)2
=1+7×2
=1+14
=15. jawaban C

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