Answer:
x = 4
Step-by-step explanation:
You may want to make everything into the same fraction to make the math easier. Because x/4 is the smallest fraction, make all of the other numbers with x match it.
3x = 12x/4, x/2 = 2x/4.
Now, 12x/4 - x/4 = 11x/4.
11x/4 + 9 = 1 - 2x/4 - 5. Now add x to one side to solve x.
13x/4 +9 = 1 - 5
13x/4 + 9 = -4
13x/4 = -13 (multiply by four on each side)
13x = -52
x = 4
I believe for this type of question you can plug in any number but this is my answer
Answer:
where's the graph? I can't see it
Choice C is correct because 10k = 125 so k is 12.5
Answer:
0.14% probability of a person guessing the right combination
Step-by-step explanation:
A probability is the number of desired outcomes divided by the number of total outcomes.
The order in which the numbers are selected is important. For example, 1,3,2 is a different combination than 3,1,2. So we use the permutations formula to solve this question.
Permutations formula:
The number of possible permutations of x elements from a set of n elements is given by the following formula:

Desired outcomes:
One right combination, so 
Total outcomes:
10 numbers from a set of 3. So

What is the probability of a person guessing the right combination?

0.14% probability of a person guessing the right combination