Ryan can paint a fence in ten hours. Asanji
can paint the same fence in eight hours. If
they worked together how long would it take
them?

9

Step-by-step explanation:

I looked up the average and it said 9.

Good luck on the rest of quarantine homework! :D

Mark brainliest if u want. ONLY if u want :D

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 -