40 miles per hour. if you take 60 divided by 1.5(the speed over time) you get 40mph
Answer:
11.25
Step-by-step explanation:
Let the width be x
The length would be 2x-5
So, 2(x+2x-5)=80
3x-5=40
3x=45
x=15.
So the width is 15 and the length would be 25.
Answer:

Step-by-step explanation:
Given
The above table
Required
The standard deviation
First, calculate the class mid-point. This is the average of the class interval.
The mid-point x is:





So, we have:

Calculate mean




The standard deviation is:




[] The fractions are

[] I see that 21 is a multiple of 7, so this one will be simple to solve.
-> 21 / 7 = 3, so we can do the following:

[] Now they have a common denominator of <u>21</u>
Have a nice day!
I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)
- Heather