P = 2w + 2l
326 = 2w + 2(99)
326 = 2w + 198
128 = 2w
w = 64
the width is 64cm
If a system has at least one solution, it is said to be consistent .
If a consistent system has an infinite number of solutions, it is dependent

Let

, where

, so that

. Then the ODE is




This is separable, so you have

Integrate both sides, solving for

if possible, then replace using

and solve for

if possible.
It's the sec0nd 0ne. I think
The length of the arc cannot be found without knowing some linear measure of the circle. None are given.
The measure of arc AB is twice that of angle APB, so is
2*108° = 216°.
The measure of arc APB is the difference between that and 360°, so is
360° -216° = 144°.