Answer:
first one is -6 and +6
Step-by-step explanation:
The number of sides is the same as the number of lines of symmetry and the order of rotational symmetry.
So, a regular decagon would have 10 lines of symmetry.
10 or u could do 25 divided by 2.5 is 10
Answer:
5 classes.
Step-by-step explanation:
You can use the
rule to determine the number of classes for a frequency distribution.
The
rule says that
where
is the number of classes
is the number of the data points
We know that the number of data points is
= 20.
Next, we start searching for
so that we can get a number 2 to the
that is larger that the number of data points.

This suggests that you should use 5 classes.
Answer:
sqrt 50
Step-by-step explanation:
First of all this is a square so if AB = 5, then AD is also 5.
Let's get rid of the other triangle and only focus on triangle ABD.
Using Pythagorean theorem we are able to solve this problem.
The Pythagorean Theorem basically states that:
a^2 + b^2 = c^2
Where a and b are the legs and c is the hypotenuse, aka the thing that we are trying to solve for right now.
Substitute these numbers in: 5^2 + 5+2 = c^2
Solve: 50 = c^2
c= sqrt 50
^ and that is our answer!