Question

Select the correct reasons for statements 1 and 3 to complete the proof.

Prove: 5x + 9 • x • 3 = 32x
1. 5x + 9 • x • 3 = 5x + 9 • 3 • x 1. ?
2. 5x + 9 • x • 3 = 5x + 27x 2. Multiplication
3. 5x + 9 • x • 3 = 32x 3. ?


A.
Associative Property of Addition, Addition

B.
Associative Property of Multiplication, Addition

C.
Commutative Property of Multiplication, Addition

D.
Commutative Property of Multiplication, Multiplication

Answer 1

What has changed in step 1?
9*x*3 became 9*3*x. What property is that?

Answer 2

dont know

Answer 3

a*b=b*a, what property is that?

Answer 4

commutative

Answer 5

yes, and what are we doing with the terms?

Answer 6

i don't know

Answer 7

a * b <-- I am ________ a by b. What's the missing word, come on.

Answer 8

..... I still don't know

Answer 9

4*2=8
What did I just do?

Answer 10

multiplacation

Answer 11

YES

Answer 12

So first step is commutative property of multiplication.

Answer 13

ok

Answer 14

5x + 27x = 32x
what did I do here?

Answer 15

addition

Answer 16

so what is the answer?

Answer 17

C.

Answer 18

i understand it now

Answer 19

good

Answer 20

thank you

Answer 21

np