Answer:
The value of x = 11
Step-by-step explanation:
Given
≅ 
Determining the value of x
As B is between A and C, so
≅ 
as
so
x + 5 = 2(x-3)
x+5 = 2x-6
2x-x = 5+6
x = 11
Therefore, the value of x = 11
Answer:
Sample size= 956
Step-by-step explanation:
Hello!
You need to construct an 80% CI for the average life of batteries. (hours)
The study variable is:
X: Lifespan of a battery.
X~N(μ; σ²)
The population standard devition isσ= 8
The interval to estimate the population mean follows the structure:
"Point estimator" ± "margin of error"
X[bar] ±
* (σ/√n)
X[bar] is the sample mean
* (σ/√n) is the margin of error of the interval (d)
Using the margin of error you can calculate the sample size:
d=
* (σ/√n)
n= (σ*
)²
n= 
n= 955.77 ≅ 956
I hope it helps!
Given:
Discount = 40%
Sales tax = 7%
To find:
The total cost of levi jeans with an original price of x.
Solution:
Let x be the original price of the jeans. Then the price after 40% discount is




The price after 7% of sales tax.




Therefore, the total cost of the levi jeans with an original price of x is represented by the expression 0.642x.
I’m pretty sure they all are real numbers-
Its 50 i think..hope it helps