Answer: The required system of equations representing the given situation is

Step-by-step explanation: Given that Sam needs to make a long-distance call from a pay phone.
We are to write a system to represent the situation.
Let x represent the number of minutes Sam talked on the phone and y represents the total amount that he paid for the call.
According to the given information,
with prepaid phone card, Sam will be charged $1.00 to connect and $0.50 per minute.
So, the equation representing this situation is

Also, if Sam places a collect call with the operator he will be charged $3.00 to connect and $0.25 per minute.
So, the equation representing this situation is

Thus, the required system of equations representing the given situation is

Answer:
x=9 because 9 is larger than 8
Force is usually measured in Newtons, the amount of matter is usually measured in kilograms.
Answer: 0.7258
Step-by-step explanation:
Given : A telemarketer makes a sale on 25% of his calls.
i.e. p=0.25
He makes 300 calls in a night, i.e. n=300
Let x be a random variable that represents the number of calls make in night.
To convert the given binomial distribution to normal distribution we have :-


Now, using
, the z-value corresponds to x= 70 :-

The z-value corresponds to x= 90 :-

By using the standard normal distribution table for z, the probability that he will make more than 70 sales but less than 90 sales:-

Hence, the probability that he will make more than 70 sales but less than 90 sales= 0.7258
-27/-2
13.5 is the answer