top and bottom margins are 7/8 inch there are 5 rows of pictures with 3/16 inch between the vertical what would be the height of each picture

Answer 1

depends on the page size. If the page height is x, the usable height is x-2(7/8) = x - 7/4

In 5 rows there are 4 3/16 spaces. So, the pictures occupy

x - 7/4 - 4(3/16) = x - 5/2 inches.
Divide that by 5 to get the picture height