Question

8 + [13 - (2 + 1)] A: -3 B: 18 C: 20

Answer 1

If you do the problem in the order of operations (PEMDAS), it should be B. 18

Answer 2

$\bf 8+[13-(2+1)]\implies \stackrel{\mathbb{PEMDAS}}{8+[13-(\stackrel{\downarrow }{3})]}\implies 8+[\stackrel{\downarrow }{10}]\implies 18$