I believe it's a , not sure though
The area of a trapezoid is basically the average width times the altitude, or as a formula:
Area = h ·
b 1 + b 2
2
where
b1, b2 are the lengths of each base
h is the altitude (height)
Recall that the bases are the two parallel sides of the trapezoid. The altitude (or height) of a trapezoid is the perpendicular distance between the two bases.
In the applet above, click on "freeze dimensions". As you drag any vertex, you will see that the trapezoid redraws itself keeping the height and bases constant. Notice how the area does not change in the displayed formula. The area depends only on the height and base lengths, so as you can see, there are many trapezoids with a given set of dimensions which all have the same area.
15 and 16
Root of 234 is roughly 15.3
The rate of change is -$45, and it represents the amount of money withdrawn each month.
We can find the rate of change by finding the change in y/change in x:
145-190/1-0 = -45/1 = -45
This would be the amount of money he withdraws from his account each month.
