Which options could be the next step in simplifying this expression?
15 + (5 + 21)
Choose exactly two answers that are correct.
A.
36 + 20 (use the commutative property)
B.
15 + 26 (use order of operations)
C.
20 + 36 (use the distributive property)
D.
20 + 21 (use the associative property)
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