Answer:
31.77% probability the surgery is successful for exactly five patients.
Step-by-step explanation:
For each patient, there are only two possible outcomes. Either the surgery is successful, or it is not. The probability of the surgery being successful for a patient is independent of other patients. 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.
A surgical technique is performed on seven patients.
This means that 
You are told there is a 70% chance of success.
This means that 
Find the probability the surgery is successful for exactly five patients.
This is P(X = 5).


31.77% probability the surgery is successful for exactly five patients.
Answer:
$17.89
Step-by-step explanation:
Net Price: $ 16.99
+ Sales Tax (5.3%): $ 0.90
Total Price: $ 17.89
X= 6y
x + y = 525
solving these two equations
6y+y = 525
y = 75
x = 6*75=450
Total revenue = 450 * .03+ 75 * .05
= 17.25
p = 3r + 2s
p - 3r = 2s <em>subtract 3r from both sides</em>
(p - 3r)/2 = s <em>divide both sides by 2</em>
Answer: (p - 3r)/2