I have Ben working on this same question for about 10 minutes. I could really use some help please.

Step-by-step explanation:

Every next term is 1/3 times of the previous term. The first term is 4.

Hence the rule is An = 4 * (1/3)^(n-1).

b

Step-by-step explanation:

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 -