There are none. The factors are 1, 5, 613, and of course 3065 and none are perfect squares.
1. Downward
2. (-4, -3)
3. No x-intercept, y-intercept is at (0, -7)
4. x = -4
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25% could be written as 0.25, so just multiply 24 by 0.25 and u get 6 blocks
If you need the square root of a number the best thing to do is use a calculator. the numerical method is much too cumbersome. if this doesn't answer your question, post an example