0 votes
1 answer
4321
If n is such that $36 \leq n \leq 72$ then $x = \frac{n^2 + 2 \sqrt{n}(n+4) +16}{n+4\sqrt{n}+4}$ satisfies$20 < x < 54$$23 < x < 58$$25 < x < 64$$28 < x < 60$
0 votes
1 answer
4323
Let $x$ and $y$ be positive integers such that $x$ is prime and $y$ is composite. Then,$y – x$ cannot be an even integer$xy$ cannot be an even integer.$\frac{x+y}{x}$ c...
0 votes
1 answer
4326
If $a, a + 2$ and $a + 4$ are prime numbers, then the number of possible solutions for $a$ is:onetwothreemore than three