ada yang bisa bantu jawab 6 dan 7?

6.) 1/x = 1/Ridho + 1/Dewa
1/x = 1/10 + 1/12
1/x = 6/60 + 5/60
1/x = 11/60
11x = 60
x = 60/11
x = 5 5/11 hari (b)

7.) 8^-2/3 + 27^-1/3
= 2^3(-2/3) + 3^3(-1/3)
= 2^-6/3 + 3^-3/3
= 2^-2 + 3^-1
= 1/2^2 + 1/3^1
= 1/4 + 1/3
= 3/12 + 4/12
= 7/12 (d)

6. jawabannya b
7. jawabnnya d