Answer:
9
Step-by-step explanation:
3p+15-3p-6
3p-3p+15-6
0+15-6
15-6
=9
Answer:

Step-by-step explanation:
The inequality sign must be changed when it is multiplied/divided by a negative number
Answer:
x = 54/343
Step-by-step explanation:

Answer:
28.6, that is, about 29 are expected to be defective
Step-by-step explanation:
For each battery, there are only two possible outcomes. Either it is defective, or it is not. The probability of a battery being defective is independent of other betteries. So the binomial probability distribution is used to solve this question.
Binomial probability distribution
Probability of exactly x sucesses on n repeated trials, with p probability.
The expected value of the binomial distribution is:

The probability that a battery is defective is 1/14.
This means that 
400 batteries.
This means that 
How many are expected to be defective?

28.6, that is, about 29 are expected to be defective
The method should be to a<span>ssign numbers to each patient and then use a random number generator to choose one hundred patients to survey. </span>