Answer:
or 
Step-by-step explanation:
The formula for finding the any side of the triangle is

We know that a=2 and c=11, so we can go ahead and plug those into the formula.


To find side b, we have to make it alone on one side. Subtract 4 on both side.

Now square root both sides, and that leaves us with:
or 
Answer:
The line that is congruent to angle 4 is angle 1
hope this helped :)
Answer:
cos3x
Step-by-step explanation:
y" - y' + 9y = 3 sin 3x


here
will be replaced by
where
is coefficient of x




y=cos3x
hence Particular solution is cos3x
The second question is (x-5)(2x+7)