Answer
$x<3$
Work Step by Step
Area of trapezoid is:
$$A=\frac{a+b}{2}\cdot h=\frac{4+8}{2}\cdot x=6x$$
Area is less than $18 ~cm^2$:
$$6x<18$$
$$x<18:6$$
$$x<3$$
Big Ideas Math - Algebra 1, A Common Core Curriculum
by Larson, Ron; Boswell, Laurie
Published by
Big Ideas Learning LLC
ISBN 10:
978-1-60840-838-2
ISBN 13:
978-1-60840-838-2
Chapter 2 - Solving Linear Inequalities - 2.1 - Writing and Graphing Inequalities - Exercises - Page 60: 57
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