The sun is vvv kilometers from the upper edge of the earth's atmosphere and qqq kilometers from the surface of the earth. which of the following expressions always represents the distance between the earth’s surface and the upper edge of the earth's atmosphere?
choose 1

(choice a)

v+q

(choice b)

| v-q|

(choice c)

none of the above

Choice B

Step-by-step explanation:

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step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -