3. If x 5 + x 4 + 6 x 3 ? 7 x 2 ? 21, on division with ( x ? 2), leaves ( p 2 ? 2) as the remainder, then what is the possible value of p?
4. If p + 4 q + 5 r = 0, then what is the value of the expression ( p 3 + 64 q 3 + 125 r 3)?
5. In which of the following quadrants the point ( x ? 5, y + 8) will lie, if x + 15 = 24 and y + 20 = 9?