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Yes, you can mix them.
$3.79
Yes, without any issues. That's what synthetic blend oils are (better than conventional oil, not quite as good as pure synthetic).
It varies from one brand to another but it averages around $7 per quart.
The price will depend on many factors, the basic 5 quart oil change in my area runs around $35.
That all depends on what weight/grade of oil you need. 5W30, 10W30, 5W20, etc. Around $3.00
Yes, you can even mix synthetic with conventional oil.
The cost of a quart of oil will depend on the brand of oil. A store brand of oil will cost under $2 dollars. A name brand oil can cost anywhere from $2.50 to $4.00 per quart.
1 quart = 946.35 milliliters of oil 1 milliliter = 0.001 quart
It they are the same weight oil as in SAE 30 weight oil there is no difference and they are identical. 30 weight oil is 30 weight oil synthetic or conventional.
Quart and a half Quart and a half
If it is the conventional oil it REALLY does NOT matter who makes it. Most conventional motor oils are the same. With conventional motor oil just use the recomended viscosity and change it often.