To add 20.4 + 3.75 + 4.25, Crystal first added 3.75 and 4.25. Which property did Crystal use to add mentally? A. Associative Property of Addition
B. Commutative Property of Addition
C. Distributive Property
D. Identity Property of Addition

Associative Property of Addition

Step-by-step explanation:

From the list of given options, option A correctly answers the question and this is because

--- (1)

or

--- (2)

The above illustrations only apply to Associative Property of Addition

In Crystal's case:

This can be compared to (1) above

Hence;

Option A answers the question

the terms of a geometric sequence can be found by beginning with the first term and multiplying by the common ratio repeatedly. a recursive formula for a geometric sequence with common ratio r is given by an=ran−1 a n = r a n − 1 for n≥2 n ≥ 2 .

step-by-step explanation:

the answer is a if my teacher taught me correct