Question

1. Which expression is equivalent to −2.1+(−5.9)+(−3.7) ?

Answer 1

Answer:

1.  −2.1−(5.9+3.7)

2.  −20+(−40)+(−60)

3.  associative properties

4.  commutative properties

5.  -43

Step-by-step explanation:

Answer 2

Answer:

1. Option b) $-2.1 - (5.9+3.7)$

2.  Option b) $-20 + (-40) + (-60)$

3. Associative property

4. Commutative property

5. -43

Step-by-step explanation:

1. We are given the expression:

$-2.1 + (-5.9) + (-3.7)$

Now, if we take minus common from the last two terms, then, the expression would be of the form:

$-2.1 - (5.9+3.7)$

Hence, the given expression is equivalent to option b) $-2.1 - (5.9+3.7)$

2.  We are given the expression:

$-40 + (-20) + (-60)$

Now, if we rearrange the terms in the expression, then, the expression would be of the form:

$-20 + (-40) + (-60)$

Hence, the given expression is equivalent to option b) $-20 + (-40) + (-60)$

3. The property mentioned here is the associative property.

$a+(b+c) = (a+b)+c$

4. The property mentioned here is the commutative property.

$a+b = b + a$

5.

$-35 + 7 + (-15)\\=7 - (35 + 15)\\= 7 - 50\\= -43$