Answer:
probability=events over the sample space
Example:

This suggests two solutions,

and

.
However, upon plugging these solutions back into the equation, you get

which checks out, but

does not because

is defined only for

(assuming you're looking for real solutions only). So, we call

an extraneous solution, and the complete solution set (over the real numbers) is

.
The answer:
The width is 7cm
Yes it is always true a biconditional statement is defined to be true whenever both parts have the same truth value.
Answer:
(-∞,4)
Step-by-step explanation:
the value is going down from the right until it reaches the vertex