tolong ya yg bisa!!!

Hambatan pengganti rangkaian seri:
Rs = R1 + R2
Rs = 7 ohm + 8 ohm
Rs = 15 ohm

Hambatan pengganti rangkaian paralel:
1/Rp = 1/R3 + 1/R4 + 1/R5
1/Rp = 1/6 + 1/3 + 1/2
1/Rp = 1/6 + 2/6 + 3/6
1/Rp = 6/6
Rp = 6/6
Rp = 1 ohm

Hambatan pengganti rangkaian:
= Rs + Rp
= 15 ohm + 1 ohm
= 16 ohm (b)