I've attached a plot of one such cross-section (orange) over the region in the x-y plane (blue), including the bounding curves (red). (I've set

for this example.)
The length of each cross section (the side lying in the base) has length determined by the horizontal distance

between the y-axis

and the curve

. In terms of

, this distance is

. The height of each cross section is twice the value of

, so the area of each rectangular cross section should be

.
This means the volume would be given by the integral
Answer is C. 13 Find with Magnitude √(x1-x2)²+(y1-y2)² = √25+ 144 = √169 = 13 units
The right answer is -8/3
please see the attached picture for full solution
hope it helps
18- j
19- c
20- h
Hope this is right lol
X/w=y/5
wy=5x
wy/5=x
w/5=x/y
it should be a