Answer:
No, his estimation is not accurate.
Step-by-step explanation:
Given,
He plans to purchase five items that cost $5.79, $7.63, $3.46, $2.99, and $3.65.
Since, 5.79 ≈ 6, 7.63 ≈ 8, 3.46 ≈ 3, 2.99 ≈ 3, 3.65 ≈ 4,
Thus, total amount of his purchasing = 5.79 + 7.63 + 3.46 + 2.99 + 3.65 ≈ 6 + 8 + 3 + 3 + 4 = 24
But, 24 > 20,
Hence, his money is not enough for his purchases,
⇒ He did not estimate accurately because he did not round the prices correctly.