Answer:
AB =
Step-by-step explanation:
calculate the distance using the distance formula
d =
with (x₁, y₁ ) = B (3, 2 ) and (x₂, y₂ ) = A (7, 4 )
AB =
=
=
=
≈ 4.47 ( to 2 dec. places )
11. Square ABCD shown has sides of length 10 centimeters. The unshaded
1 answer:
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Answer:
C. n=423
Step-by-step explanation:
1) Notation and important concepts
Margin of error for a proportion is defined as "percentage points your results will differ from the real population value"
Confidence=90%=0.9
represent the significance level defined as "a measure of the strength of the evidence that must be present in your sample before you will reject the null hypothesis and conclude that the effect is statistically significant".
represent the sample proportion of consumers in the Oconee County area who would react favorably to a marketing campaig. For this case since we don't have enough info we use the value of 0.5 since is equiprobable the event analyzed.
represent a quantile of the normal standard distribution that accumulates
on each tail of the distribution.
2) Formulas and solution for the problem
For this case the margin of error for a proportion is given by this formula
(1)
For this case the confidence level is 90% or 0.9 so then the significance would be
and
With , we can find the value for
using the normal standard distribution table or excel.
The calculated value is
Now from equation (1) we need to solve for n in order to answer the question.
Squaring both sides:
And solving for n we got:
Now we can replpace the values
And rounded up to the nearest integer we got:
n=423
Answer:
OB: 4 sides
Step-by-step explanation:
A parallelogram has 4 sides. It is a flat shape with opposite sides parallel and equal in length. Opposite angles are equal.
In the picture below, angles "a" are the same, and angles "b" are the same.
In the case of a parallelogram where all angles are right angles, is a rectangle.
