Question

Express in roaster form:
$A=\{x+1:4x+7<25,x\in N\}$

Answer 1

$A=\{x=1:4x+7<25,x\in N\}$

Relation $\Rightarrow 4x<25-7$

$x<\frac{9}{2}$

$x=1,2,3,4$

$A=\{2,3,4,5\}$ is the roaster form.