Question

Substitute 4 in for x in all of the expressions below. Then, select all of the expressions with a value of 20. extes 4x44 2(x+6) 5(2x - 4) 7x - 2x

Answer 1

$\begin{gathered} 1.\text{ }4\times4+9=25(wrong) \\ 2.\text{ }4\times4+4=20\text{ (right)} \\ 3.\text{ }2(4+6)=20(right) \\ 4.\text{ }5(2\times4-4)=20\text{ (right)} \\ 5.\text{ }7\times4-2\times4=20\text{ (right)} \end{gathered}$