Answer:
B
Step-by-step explanation:
Hello!
The answer for A is:

The answer for B is: The rocket will hit the lake surface in 5 seconds.
<h2>Why?</h2>
Defining the terms:

So, replacing it in the quadratic equation (it's given to you in the exercise)\\



We are working with a quadratic equation, so we will have two possible results,

Now, we are asked to find the time, time can not be a negative value, we have to discard X1 (-1) since it's a negative value, knowing that, the rocket will hit the lake after 5 seconds.
Have a nice day!
Answer:
The value of the test statistic is 2.8.
Step-by-step explanation:
The test statistic is:

In which X is the sample mean,
is the value expected value for the population mean,
is the standard deviation and n is the size of the sample.
Sales at a fast-food restaurant average $6,000 per day
This means that 
Sample of 49
This means that 
The sample showed average daily sales of $6,400.
This means that 
Population standard deviation is about $1,000.
This means that 
The value of the test statistic is



The value of the test statistic is 2.8.
Answer:
D
Step-by-step explanation:
I'd say the best option is D. not 100% sure but I'd say that's the best option
Answer:
B
Step-by-step explanation: