Use the periodic table to find the molar mass of
each element
molar mass h =
g/mol
molar mass s =
g/mol
molar mass o =
g/mol

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

answer: 42

use a calculator to find that 845/73 = 11.575

the whole part of the answer is 11. multiply this by 73 to get 11*73 = 803.

subtract that result from 845 to get 845 - 803 = 42