When Lydia buys 4 jewelry sets, the amount spent is $24.
From the information given, we are told that Michelle is preparing for her birthday and that each set is $5 and shipping is $4 flat. If Lydia buys 4 jewelry sets.
Therefore, the equation will be:
4 + (5 × x)
where x = number of set
4 + 5x
4 + (5 × 4)
= 4 + 20
= $24
The amount is $24.
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