-8a-3b+6b-5a+9b= -13a-18b
-8a-5a=-13a
3b+6b+9b=18b
Hopes that helps
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We know that, Area of a Circle is given by : πR²
Where : R is the Radius of the Circle.
We can Notice that : The Given Figure is One - Fourth of the Circle with Radius 'R'

We can Notice that : The Quarter of the Circle is divided into 3 Equal Parts and The Shaded Region is One of the Equal Part.


Answer:
: 5 (4x - 9) - if u wanted me to solve this or just simplifie it also im not fully confident in this im sure the second person answering this is better anyways
2: 9x + 4
3: 12 + 2x
Step-by-step explanation: correct me in comments plz bc im not confident in thisss