Answer:
All materials to cover the whole area would cost $650.
Explanation:
The formula to find the area of a trapezoid is
Where
is the largest base,
is the smallest base, and
is the height. So, in this problem each variable would be
Replacing these values, we have
So, if each unit of area cost $5, we just need to multiply it with the total area of the trapezoid
Therefore, all materials to cover the whole area would cost $650.