Name at least 4 other gases in the atmosphere besides oxygen and nitrogen

Frequency of electromagnetic waves that a radio station is assigned is called

Aphase diagram assumes is kept constant.

Abus travels 280km south along a straight path with an average velocity of 88km/h to the south. the bus stops for 24 min, then it travels 210 km south with an average velocity of 75 km/h to the south. how long does the total trip last?