Is the time it takes for a light bulb to burn out discrete or continuous?

(a) the random variable is discrete.
(b) the random variable is continuous.

Option 'B' is correct.

Step-by-step explanation:

Since we know that

Discrete variables are those variables in which values are distinct and countable.

Continuous variables are those variables in which values are in continuous interval or time interval.

Since the time takes for a light bulb to burn out take few minutes or several hours or days.

So, it is considered as "continuous variable".

Hence, Option 'B' is correct.

3; 9 is 8 to -4

step-by-step explanation:

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)