Question 1062318
A right rectangular prism has a {{{height}}} ,
and a rectangular base with a {{{length}}} and a {{{width}}} .
The volume is {{{(length)*(width)*(height)}}}
In this case, there is a {{{highlight(square)}}}{{{base}}}, with
{{{length=width =x}}} , and
{{{height= x+3}}} ,
so the volume is
{{{x*x*(x+3)=x^2+(x+3)=highlight(x^3+3x^2)}}} .
 
NOTE: Even if pressed for time, you do not read every word,
and miss the word {{{highlight(square)}}} ,
{{{height=(x+3)}}} should be a factor,
and so would base length {{{x}}} ,
so you could eliminate options
{{{X^3+9}}} and {{{x^3+3x+3}}} ,
because they do not have {{{x}}} as a factor.