Question

Write the following as an algebraic equation. Use x as the unknown ams use a sum. A number increased by 12.8 is equivalent to 140.8.

Answer 1

the name of the missing number is x

then, this number plus 12.8 is equal to 140.8

$x+12.8=140.8$

we can find the missing number if we make a subtract of 12.8 on both sides

$\begin{gathered} x+(12.8-12.8)=140.8-12.8 \\ x+(0)=140.8-12.8 \\ x=128 \end{gathered}$

Value of the unknow is 128