#5: google for "random numbers in c", I glanced at the top 3 results and 2 of them have enough information to answer this.
#6: reread the question... you correctly figured out the square root of something in #9, just do the same sort of thing and assign it to the variable they want
#7: yeah... start this one over... it doesn't bear anything but passing resemblance to the question
#8: Here, I'll get you started. "a function that receives four double numbers" might look like:
Code:
void question_eight(double numberA, double numberB, double numberC, double numberD)
{
 // This is a void function so doesn't need a return statement.
}
Now, the next thing it says is that it's going to have to return the average of the supplied numbers. So you'd pick a type of value to return (let's say a double), and replace the 'void' type with that type. There, you now have an empty function set up to take four doubles (but of course it needs to return something... and they have naming requirements that I didn't cover... and of course there's some math... and so forth).
#9: You used the 'pow' function correctly in #10, but not here.
#10: I don't see any square rooting being done here.