Help with 3 and 4 (easy and I’ll give brainliest I’m just being lazy haha)

3. Some of the non living or abiotic factors in this picture are the water, the sky, fallen tree, and the sun.

4. The living organisms might interact with the non living parts of the environment by using them as shelter or a necessary resource (like water).  

Step-by-step explanation:

step-by-step explanation: 2

see explanation

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 -