Answer:
x=0, -20/3.
Step-by-step explanation:
abs(3x+10)=10
3x+10=10, 3x+10=-10
3x=10-10, 3x=0, x=0/3, x=0,
3x=-10-10, 3x=-20, x=-20/3
Use the formula A= height*base/2
Answer:
you should know this. you tell me how many?
Answer: 
Step-by-step explanation:
Given : The speeds of vehicles traveling on a highway are normally distributed .
Standard deviation: 
Since , sample size :
, which is small sample (n<30) so the test applied here is a t-test.
Degree of freedom= 
Sample mean : 
Level of significance : 
Then , significance level : 
Using t-distribution table , Critical value : 
The confidence interval for population mean is given by :-


Hence, a 98% confidence interval for the population mean=