Cereal A supermarket finds that the number of boxes of a new cereal sold increases each week. In the first week, only 20 boxes of the sold and in the
were sold. In the next week, 53 boxes of the cereal were sc
third week 86 boxes of the cereal were sold. The number of
boxes of cereal sold each week represents an arithmetic sequence.
cereal sold in week n? What is the explicit rule for the arithmetic sequence that defines the number of boxes of

33n - 13

Step-by-step explanation:

20, 53, 86?

That's an arithmetic sequence with the common term being 33.

The explicit formula? 33n - 13. :)

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 -