Answer:
11-6√3 = a -b√3
where a=11 and b =6
Step-by-step explanation:
<u><em>Step(i):-</em></u>
Given

Rationalize
= 
= 
= 
= 
<u><em>Step(ii):-</em></u>
<em>Multiply</em>
<em> </em>
= 5 × 7 - 5×4√3 + 2√3 ×7 - 2√3 × 4√3
= 35 -20√3+ 14√3-8×3
= 35 - 6√3 -24
= 11-6√3
V = l*w*h
20 = 5*w*8
20 = 40*w
divide both sides by 40
20/40 = w
1/2 = w
The width is 1/2 inch