A long solenoid with 10.0 turns / cm and a radius of 7.00 cm carry a current

Question:

A long solenoid with 10.0 turns / cm and a radius of 7.00 cm carry a current of 20.0 mA. A current of 6.00A exists in a straight conductor located along the central axis of the solenoid.
(a) At what radial distance from the axis will the direction of the resulting magnetic field be at 45.0° to the axial direction?
(b) What is the magnitude of the magnetic field there?