Yes, you can even mix them.
Yes. Marvel mystery oil is fully compatible with synthetic oil.
Similar outer shell
Sure. Here are a few: -- an equilateral triangle with sides of 50 mm -- a square or a rhombus with sides of 37.5 mm -- a regular pentagon with sides of 30 mm -- a regular hexagon with sides of 25 mm etc.
32 mm
Multiply by 1000.
41 mm
It is: 8*36 = 288 mm
35 mm x 8 = 280 mm
6 * 55 mm = 330 mm
A regular pencil: 6-7 mm wide.
13 mm or 15 mm
80 mm, 8·10=80. shift+option+9=·