Answer: 
Step-by-step explanation:
The confidence interval for population mean is given by :-
Given : Sample mean : 
hours
Standard deviation
hours
Sample size : n=90, which is a large sample(n<30), so we use z-test.
Significance level: 
Critical value : 
Then , the confidence interval for population mean will be :-
Hence, the 90% confidence interval for the mean life 
of all light bulbs of this type. is
Answer:
b = 4 inches, c = ~5.66 inches
Step-by-step explanation:
The triangle is isosceles so b is equal to the adjacent side. Use the Pythagorean theorem to find c.
Y=mx + b where b is y intercept and m is the slope. So what we need to do is to plug in the slope and the y and x values from the point. So, -4=1/2 times 8 + b. =-4=4+b. Now let's solve for be. -4-4=-8. b=-8. To verify, 4-8 is -4, so this statement is true. Now let's plug our values. y=1/2x-8. So therefore our answer will be y=1/2x-8.
Answer:
(f+g)(x) = 6x^2 +5x+10
Step-by-step explanation:
f(x)=7x+7 and g(x)= 6x^2-2x+3
find (f+g)(x)
We will add the 2 functions. I like to line them up vertically.
f(x)= 7x+7
g(x)= 6x^2-2x+3
-------------------------------
(f+g)(x) = 6x^2 +5x+10
Answer:
31217.34
Step-by-step explanation:
92000+92800+99000+100500+105000=489300/5=97860 avg salary
97860X.0145=1418.97x22=31217.34
