Question 1179688
.
<pre>

This shape is a trapezoid with one base (vertical) of f(1) = 1+3 = 4 units at x=1

and the other base (vertical) of f(3) = 3+3 = 6 units at x=3.


The height of the trapezoid is  3-1 = 2 units long (horizontally).


To find the area, apply the formula for the trapezoid area


    AREA = {{{((4+6)/2)*2}}} = 4 + 6 = 10 square units.      <U>ANSWER</U>
</pre>

Solved, answered and explained.