Read the sentence.
Which best describes the punctuation error in the
sentence?
We're not sure if the tickets are for the preview night, the
opening night, this weekend or next week.
Both commas should be deleted.
There should be a colon after "for."
The commas should be replaced by semicolons.
There should be a comma after weekend."
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There should be a comma after weekend.

Explanation:

Punctuation is the use of different grammatical signs that shows the correctness of a given sentence. These punctuation marks are used in different ways, according to their own uses. They may be the comma, the semicolon, inverted commas, full-stop, etc.

In the given sentence, the use of the commas to differentiate the different duration is correct. But at the same time, the comma must also be placed next to "weekend" to make the sentence a free-flowing one. It also acts as a separation for two or more lists in a sentence.

Thus, the correct answer is the fourth option.

showing or suffering from nervousness, fear, or a lack of confidence

the boy's acceleration toward the girl is 2.08 m/s^2.

explanation:

according the newton's third law, the force causing the girl accelerate towards the boy will be me with equal counter-force causing the boy to accelerate towards the girl. these forces will be of equal magnitude and allows us to determine the boy's acceleration:

the boy's acceleration toward the girl is 2.08 m/s^2.