I don't mean to be clicking just to get a point without answering the question but there's no comment option.
Is there more to the question, any more info?
Answer:





Step-by-step explanation:
For each homeowner, there are only two possible outcomes. Either they have invested in earthquake insurance, or they have not. The probability of a home owner having invested in earthquake insurance is independent from other homeowners. So we use the binomial probability distribution to solve this question.
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.
32% of all homeowners are insured against earthquake damage.
This means that 
Four homeowners are to be selected at random.
This means that 
Find the probability distribution of X.
This is the probability of each outcome






Answer:
x = 75
Step-by-step explanation:
Corresponding angles on the same side of the transversal are equal
10x + 5 = 12x - 9 Add 9 to both sides
10x + 5 + 9 = 12x Combine
10x + 14 = 12x Subtract 10x from both sides
14 = 12x - 10x Combine
14 = 2x Divide by 2
2x = 14
x = 14/2
x = 7
==================
10x + 5 = 10*7 + 5
10x + 5 = 75
12x - 9 = 12*7 - 9
12x - 9 = 84 - 9
12x - 9 = 75
He would have to work 13 hours
Cross multiply: 60%/100% =21/x
X is the variable we are trying to find.
100*21=2,100
2,100/60
X =35
All together in the choir there are 35 members.
I hope this helps!