Answer 121°
Step-by-step explanation:
All triangles have an interior angle sum of 180.
From this you can subtract 103 and 18 to get 59.
The line that r is connected to is 180° (hence being a line)
This means you can subtract 59 from 180 to get 121°
The answer is B.
in the original equation, CH4 + O2 → CO2 + H2O, there are:
REACTANTS: 2 carbon, 4 hydrogen, 2 oxygen
PRODUCTS: 2 carbon, 2 hydrogen and 1 oxygen.
If we change the equation to this,
CH4 + 2O2 → CO2 + 2H2O, then there are now:
REACTANTS: 2 carbon, 4 hydrogen, 4 oxygen
PRODUCTS: 2 carbon, 4 hydrogen, 4 oxygen
and thus the equation is balanced
standard form for a complex expression, I assume it means the a + bi form, nothing else
