## College Algebra (6th Edition)

$[6, ∞)$
Plug the given conditions into an inequality. Put similar terms on either side. Then simplify by isolating $x$. The words "at least" or "at most" imply that a value is greater than or less than the other side. $1-(x+3)+2x\geq4$ $-x-2+2x\geq4$ $x\geq6$ $[6, ∞)$