Answer:
We need to sample at least 1069 parents.
Step-by-step explanation:
We have that to find our 
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of 
.
So it is z with a pvalue of 
, so 
Now, find the margin of error M as such
In which 
is the standard deviation of the population and n is the size of the sample.
How many parents do you have to sample?
We need to sample at least n parents.
n is found when 
. So
Rounding up
We need to sample at least 1069 parents.
Answer:
i do bellieve it is c
Step-by-step explanation:
Answer:
The correct option is:
1/81
Step-by-step explanation:
The given expression to us is:
(3²)⁻²
In this expression, the two powers, which are 2 and -2, are multiplying with each other, we can write it as:
(3)⁻⁴
Now we know that a negative power of a number can be converted into a positive power one if we take reciprocal of the given number.
It can be written as:
(1/3)⁴
Further simplify the expression:
1/81
Thus the correct choice from the given options is:
1 over 81 or 1/81
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Answer:
BD = BE
Step-by-step explanation:
Given:
∠ BDA = 90°
∠ BEA = 90°
AD = AE = radii of circle A
We need to find measures of BD and BE.
Solution:
we know that BD and BE are tangents drawn from one external point B to Circle A.
Now by theorem which states that;
"When two tangents drawn to a Circle from one external point then their measures are said to be equal or we can say Tangents are equal."
So from above theorem we can say that;
BD = BE
