Algebra

Answer all the questions below and press submit to see how many you got right.

id: 9368

What is the value of the expression $3x$ for $x=5?$

id: 9432

What is the value of the expression $(x+1)(x-1)$ for $x=3?$

id: 9388

What is the value of the expression $x+1$ for $x=4?$