12x+10-5x
12x-5x+10 ( combine like terms)
12x-5x= 7x
Answer: 7x+10
4/6, 12/15, 8/12 are some of the expressions
Answer:
0.8746 = 87.46% probability of at least 6 failures in 7 trials.
Step-by-step explanation:
Binomial probability distribution
The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

In which
is the number of different combinations of x objects from a set of n elements, given by the following formula.

And p is the probability of X happening.
7 trials
This means that 
The probability of success in any trial is 9%?
So the probability of a failure is 100 - 9 = 91%, which means that 
Probability of at least 6 failures in 7 trials?
This is:

In which




0.8746 = 87.46% probability of at least 6 failures in 7 trials.
Answer:
The third one 54
Step-by-step explanation:
I hope it helps.