6. write the following proportion using colons. 7 is to 21 as 3 is to 9. a. 7: 21 = 3: 9 b. 7: 3 = 21: 9 c. 21: 7 = 3: 9 d. 7: 21 = 9: 3

A. 7:21 = 3:9

Step-by-step explanation:

7 is to 21 as 3 is to 9.

Replace the word to with colons and the word as with the equals sign

7:21 = 3:9

true statements:

a) x + y = y + x   ⇒ commutative property of addition

b) (x * y) * z = x * (y * z) ⇒ associative property of multiplication

d) (x + y) + z = x + (y + z) ⇒ associative property of addition

false statements:

c) x - y = y - x   should be: x - y = - y + x

e) (x - y) - z = x - (y - z) should be: (x - y) - z = x - (y + z)

step-by-step explanation:

answer: -2+√x,-2-√x

i hope this , i don't know if you're looking for a pair or not.