One gallon is equal to about 3.785 liters what is this amount rounded to the nearest tenth

 1 gallon = 3.8 liters rounded to the nearest tenth.

Explanation:

  1 gallon = 3.785 litres.

  We have to round this in to nearest tenths, nearest tenth means number of figures after decimal = 1.

  Here last digit is 5 so we have to add 1 to previous digit.

  So, 3.785 rounded will become 3.79

  For 3.79 the last digit is 9 so we have to add 1 to previous digit.

  So, 3.79 rounded will become 3.8

  3.785 liters rounded to the nearest tenth is 3.8 liters.

  1 gallon = 3.8 liters rounded to the nearest tenth.

the part of the wave he is travelling on is the crest

snell's law

refractve index = sin incidence / sin refraction