Let digits be ( a, b, c ) with ( a \ge 1 ), ( a+b+c = 4 ). Case by ( a ):
Practice multiplication tables up to 25×25, fraction/decimal conversions, and squaring numbers ending in 5 (e.g., (35^2 = 1225)).
What is the value of $x$ in the equation $2x + 5 = 11$?
