Answer:
3
Step-by-step explanation:
Check out the image attachment for one way to draw this problem out. Notice how angles AEC and DEB are vertical angles, so that means they are congruent angles
(measure of angle AEC) = (measure of angle DEB)
6x + 20 = 10x
6x + 20-6x = 10x-6x ... subtract 6x from both sides
20 = 4x
4x = 20
4x/4 = 20/4 ... divide both sides by 4
x = 5
The value of x is 5.
Let's check the answer
6x + 20 = 10x
6*5 + 20 = 10*5 ... replace every x with 5
30+20 = 50
50 = 50
We have confirmed the answer.
Answer:
720
Step-by-step explanation:
The permutation looks like this for that set of data:

and the formula to solve it like this:

which simplifies down to

Since every number less than 8 in the numerator cancels out with the denominator, we have

which equals 720
Answer:
attached
Step-by-step explanation:
You should be able to do the 2nd problem yourself.
9^2 (write it like a exponent)