X=-3, y= 1 using the substitution method
To solve for the margin of error:
margin of error = critical value x standard error
To compute for the critical value:
1. compute alpha: α= 1 - (confidence level/100) = 1 - .99 = 0.01
2. Find the critical probability: p = 1 - α/2 = 1 - (0.01/2) = 0.995
3. Look for the z score at the z table, in this case it is 2.58. This is your critical value.
To compute for the standard error, the formula is:
standard error = standard deviation (σ) divided by √n = 1.6 / √420 = 0.0781
Now plug in the following in the formula:
margin of error: 2.58 * 0.0781 = 0.2014 or 0.20
The answer is letter C.

is equation of circle which have radius equal 5 and center in (0,0) point
Answer:
B) 9x² + 6x + 1
Step-by-step explanation:
(3x + 1)^2
(3x + 1) • (3x + 1)
9x² + 3x + 3x + 1
9x² + 6x + 1
Answer:
Multiply or divide 7.3 times or divided by 71.54