It’s b because I just did that question
2ab² + (-5ab²) - (-6ab²) =
2ab² - 5ab² + 6ab² =
3ab²
<span>The sum of 2ab2 and (-5ab2) is the same as the sum of (-6ab2) and 3ab</span>²
Arc length = 2

r * Θ/360 =

d * Θ/360
so...
If we take pi to be 3.14,
Arc length = 2(3.14)(6) * 98/360
= 37.68 * 98/360 =
10.26 cm