For a positive integer $n$, if both $n$ and $n 2$ are prime, then they are known as twin primes. For example, 59 and 61 are twin primes. Whether or not there are an infinite number of twin primes is a famous unsolved problem in number theory. Find all positive integers $n$ such that $n$, $n 2$, and $n 4$ are all prime.

Use the data on the dot plot to answer the question.how many people read for more than three hours last week? i'm on a unit test review

What is the value of x in the this question ?

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.