Since A = bh
and A = 198 and b = 18?
h = A/b
= 198/18
= 11
Do you have a protractor? If so, use it and place the center whole, that is located at the bottom, and place it on the dot of the angle. where the arrow hits, is your angle degree. You should be able to identify the angle type.
The average value of a continuous function <em>f(x)</em> over an interval [<em>a</em>, <em>b</em>] is given by the integral,

Compute the integral for <em>f(x)</em> = <em>e</em> ⁻ˣ over [0, 3] :
