Please help answer much as possible there's 4 questions

What color of light must blue light mix with to create white light? a. yellow b. white c. blue d. green

Avery long solenoid of inner radius 2.75 cm creates an oscillating magnetic field of the form = for this solenoid, =0.00425 t and =319 rad/s. (a)what is the maximum value of the induced electric field at a perpendicular distance 1.45 cm from the axis of the solenoid? (b) what is the maximum value of the inducted electric field at a point 5.85 cm perpendicular from the axis of the solenoid?

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value