Answer:
609
Step-by-step explanation:
Standard deviation = = $30
Margin of error = E = $2
Confidence level = 90%
Since the distribution is said to be normal, we will use z scores to solve this problem.
The z score for 90% confidence level = z = 1.645
Sample size= n = ?
The formula to calculate the margin of error is:
Using the values in above equation, we get:
This means, the minimum number of observations required is 609
Answer:
13
Step-by-step explanation:
refer the image attached below
Answer: 17
Step-by-step explanation:
To break even your revenue must be equal to your cost.
So, 12x=170+2x
12x-2x=170
10x=170
x=170/10=17
So, Joan needs to sell 17 necklaces to break even.
Answer:
There are no solutions.
Step-by-step explanation:
−2(4x−2)<−8x+4
Step 1: Simplify both sides of the inequality.
−8x+4<−8x+4
Step 2: Add 8x to both sides.
−8x+4+8x<−8x+4+8x
4<4
Step 3: Subtract 4 from both sides.
4−4<4−4
0<0
Answer:
Nonlinear
Step-by-step explanation:
Because -6 has a exponent, which is 2.