#### Answer

a)yes
b)no
c)no

#### Work Step by Step

A) $\frac{6-0.5}{0.5}$≥11
$\frac{5.5}{0.5}$≥?11
11≥11
Correct
b) $\frac{6-2}{2}$≥11
$\frac{4}{2}$≥11
2 ≥11
Incorrect
c) $\frac{6-4}{4}$≥11
$\frac{2}{4}$≥?11
$\frac{1}{2}$ ≥11
Incorrect
The only correct one is A