I need help thank you​

Astronomers discover an exoplanet (a planet of a star other than the sun) that has an orbital period of 3.87 earth years in its circular orbit around its sun, which is a star with a measured mass of 3.59 x 1030 kg. find the radius of the exoplanet's orbit.

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?