Answer:
25, 36, 49
Step-by-step explanation:
Start with a definition of perfect squares. Basically, they're the result of a number multiplied by itself. 2*2, or 2² = 4, which is a perfect square. 3*3, or 3² = 9, and so on. You can keep listing these until you get inside the interval you want (from 22 to 50).
4² = 16
5² = 25 ... so now we're where we want to be!
6² = 36 ... still good
7² = 49 ... that's lower than 50 still
8² = 64 ... and now we're over our limit, so 8 doesn't do the job for us.
The only perfect squares matching your criteria are 25, 36, and 49.