Please help me with the question below:

A 900 W toaster takes one minute to toast a slice of bread. At 9.0 cents/(kW.h), how much does the toast cost? cost: centsFind the frequency f in terahertz of visible light with a wavelength of 463 nm in vacuum. f: 6.48 x1014 THz What is the wavelength A in centimeters of electromagnetic microwave radiation whose frequency is 6.65 GHZ? A = 4.511 cm A 15.0 cm tall cup is placed 81.5 cm away from the center of a concave mirror with a focal length of 29.0 cm. What is the height of the cup's mirror image? image height: '3-001 cm Is the image upright or inverted? O upright o inverted Is the image real or virtual