Answer:

1. 15.18 Ohms

2. 303 Ohms

3. 34.31 Ohms

4. 215 Ohms

Step-by-step explanation:

1. RT = 1/(1/32+1/47+1/75) = 15.18 Ohms

2. RT = 128+98+77 = 303 Ohms

3. RT = 1/(1/110+1/88+1/115) =  34.31 Ohms

4. RT = 56+73+86 = 215 Ohms