Question

Fill in the blank so that the resulting statement is true. Name the property of real numbers used; commutative, associative, identity, inverse or distribute.Questions attached

Answer 1

Answer

• 80. Commutative property: (-5)(-7) = (-7)(-5)

,

• 84. Distributive property:

$3(4+5)=3\cdot4+3\cdot5$

Explanation

80.

Using the commutative property of the multiplication where:

$(a)(b)=(b)(a)$

We can apply it to our problem and get:

$(-5)(-7)=(-7)(-5)$

84.

Using the distributive property of the multiplication where:

$a\cdot(b+c)=ab+ac$

We can apply it to our problem:

$3(4+5)=3\cdot4+3\cdot5$