Answer:
1/5 chance
cause there are 5 people in the family and there is 1 brother and 1 spot for the front of the line
Step-by-step explanation:
Answer:

And we can use the cumulative distribution function given by:

And for this case we can write the probability like this:

And then the final answer for this case would be 
Step-by-step explanation:
For this case we define our random variable X "price of gasoline for a city in the USA" and we know the distribution is given by:

And for this case the density function is given by:

And we want to calculate the following probability:

And we can use the cumulative distribution function given by:

And for this case we can write the probability like this:

And then the final answer for this case would be 
Im not sure use a caculator with it
Answer: the answer is -3
Step-by-step explanation:
-3y-7=2 you add 7 to both side that make -3y=9
then you divide by -3 in both side and the answer will be -3