An athlete preparing for a marathon runs 21.3 miles. How many kilometers did they run? (please give fourmula)

Which statement describes both homogeneous mixtures and heterogeneous mixtures?

An alpha particle is: a hydrogen atom a nucleus of helium two neutrons an electron

C=59(f−32)the equation above shows how temperature f, measured in degrees fahrenheit, relates to a temperature c, measured in degrees celsius. based on the equation, which of the following must be true? a temperature increase of 1 degree fahrenheit is equivalent to a temperature increase of 59 degree celsius. a temperature increase of 1 degree celsius is equivalent to a temperature increase of 1.8 degrees fahrenheit. a temperature increase of 59 degree fahrenheit is equivalent to a temperature increase of 1 degree celsius. a) i onlyb) ii onlyc) iii onlyd) i and ii only