Ineed with question 17 and 18 and it’s very hard and i’m struggling with it and if you need to see the picture big then click on it and it will be big

answer; economic order quantity;

the answer to your question is c.

if you read the house of usher you should know that the house was haunted

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).