Answer:
trgfdsvcx
Step-by-step explanation:
kj,m
Answer:
14.25 because for every 1/2 inch, the car is 2 feet.
Step-by-step explanation:
Answer:
2.70 hours to travel 180 mi.
Step-by-step explanation:
The distance traveled (d) varies directly as the time (t) of travel, by the following formula:

In which s is the velocity.
It takes 63 min to travel 70 mi.
So i am going to find the velocity in miles per minute

how many hours would it take to travel 180 mi?
I am first going to find the time in minutes, then divide by 60 to pass to hours.





It takes 162.16 minutes = 162.16/60 = 2.70 hours to travel 180 mi.
A) w + 7 = L
B) w * L = 120
A) w = L -7 then substituting this into B)
(L-7) * L = 120
L² -7L = 120
L² -7L -120 = 0
Solving by quadratic Formula:
L1 = 15
L2 = -8
If length = 15, then width = 8
Answer:


Step-by-step explanation:
Notation
represent the sample mean
population mean (variable of interest)
s represent the sample standard deviation
n represent the sample size
Solution to the problem
The confidence interval for the mean is given by the following formula:
(1)
For this case the 9% confidence interval is given by:

We can calculate the mean with the following:

And we can find the margin of error with:

The margin of error for this case is given by:

And we can solve for the standard error:

The critical value for 95% confidence using the normal standard distribution is approximately 1.96 and replacing we got:

Now for the 98% confidence interval the significance is
and
the critical value would be 2.326 and then the confidence interval would be:

