One card costs $
i. One pencil costs $(
i + 15). One story book costs $4
i.
- Riordan bought 4 cards, 3 pencils and 1 story book. How much did he spend? Simplify your answer in terms of i.
- If i = 7, how much did Riordan spend altogether?
(a)
Cost of 4 cards = 4 x
i = $4
i Cost of 3 pencils = 3 x (
i + 15) = $(3
i + 45)
Cost of 1 story book = $4
i Total amount that he spent
= 4
i + 3
i + 45 + 4
i= 4
i + 3
i + 4
i + 45
= $(11
i + 45)
(b)
If
i = 7,
total amount that he spent
= 11
i + 45
= (11 x 7) + 45
= 77 + 45
= $122
Answer(s): (a) $(11
i + 45) or $(45 + 11
i); (b) $122