25
5/4
A short summary has 10 lines.
In the shape of a 5-pointed star. Place a ball on each corner and there will be 5 lines of 4 balls
23/4
a star drawn with five lines will give you 10 dots on 5 lines with only 4 dots on each line. (or) simply draw a pentagon and put a cap ( a inverted 'V') on all sides.
10
3 quaters, 5 dimes, 5 nickels, and 6 pennies
5 pairs of parallel lines, plus a set of 5 parallels.
about two-three lines
100 A rectangle is formed by 2 horizontal lines and 2 vertical lines. There are 5 horizontal and 5 vertical lines so the number of rectangles is 5C2 * 5C2 = 10 * 10 = 100
no answer