Step-by-step explanation:
To multiply the fractions, like

Multiply the top,
then multiply the bottom.

Try to use a calculator if you aren't arithmetic heavy, but I suggest you to try to remember them because they are going to be helpful for courses like Algebra, Calculus, Statistics, etc.
To divide fractions, like

You take the top number,

Then you flip the bottom number,

Then multiply the two

And that is your answer. Comment if you need more clarification
Answer:
16:20??
Lol I think it's wrong sorry.
Step-by-step explanation:
If this an angle on a straight line the answer is k=73°
Answer: 30 i think 10x3=30
Step-by-step explanation: