Step 1 :Calculate the charges for the first 4 hours using the formula: \(65 + 42 * hours\)
Step 2 :\(65 + 42 * 1 = 107\)
Step 3 :\(65 + 42 * 2 = 149\)
Step 4 :\(65 + 42 * 3 = 191\)
Step 5 :\(65 + 42 * 4 = 233\)
Step 6 :\boxed{\text{a) The possible charges for the first 4 hours are: } 107, 149, 191, 233}\
Step 7 :Calculate the charge for 10 hours using the formula: \(65 + 42 * hours\)
Step 8 :\(65 + 42 * 10 = 485\)
Step 9 :\boxed{\text{b) The charge for 10 hours of time is } 485}