Answer: C.) –3, 4.
Step-by-step explanation: Given equation .
Subtracting x^3 from both sides, we get
.
.
Adding 13x and 12 on both sides, we get
.
.
Dividing whole equation by -2, we get
.
Factoring quadratic, we get
.
x-4=0 and x+3=0
<h3>x=4 and x=-3.</h3>Answer: -3 degrees per hour.
Step-by-step explanation:
Given: The temperature fell from 0 degrees to degrees below 0 in
hours.
The change in temperature=
degrees
Time taken to change the temperature= hours
Now, the temperature change per hour is given by :-
Answer:
The probability that his/her household has four or more cell phones in use is 0.122 or 12.2%.
Step-by-step explanation:
<u>The complete question is</u>: In a survey of consumers aged 12 and older, respondents were asked how many cell phones were in use by the household. (No two respondents were from the same household.) Among the respondents, 215 answered "none", 280 said "one", 362 said "two", 149 said "three," and 140 responded with four or more. A survey respondent is selected at random. Find the probability that his/her household has four or more cell phones in use. Is it unlikely for a household to have four or more cell phones in use? Consider an event to be unlikely if its probability is less than or equal to 0.05.
We are given that among the respondents, 215 answered "none", 280 said "one", 362 said "two", 149 said "three," and 140 responded with four or more.
A survey respondent is selected at random.
As we know that the probability of any event is calculated as;
Probability =
Here, we have to find the probability that his/her household has four or more cell phones in use;
Number of respondent having four or more cell phones in use = 140
Total number of respondents asked = 215 + 280 + 362 + 149 + 140 = 1146
<u>So, the required probability</u> =
= 0.122 or 12.2%
No, it is not unlikely for a household to have four or more cell phones in use because the probability is not less than or equal to 0.05 but in actual it is greater than 0.05.