EXPLANATION
Given the Trapezoid, its surface is given by the following equation:
[tex]Area=\frac{1}{2}h(a+b)[/tex]Where a=long base= 14, b=short base= 10 h=altitude= 7
Now, replacing terms:
[tex]\text{Area}=\frac{1}{2}7(14+10)[/tex]Adding terms:
[tex]\text{Area}=\frac{7}{2}(24)[/tex]Removing the parentheses and simplifying:
[tex]\text{Area}=84[/tex]So, the answer is 84 units.