Answer:

Step-by-step explanation:
In this problem we have a horizontal ellipse, because the major axis is the x-axis
The equation of a horizontal ellipse is equal to

where
(h,k) is the center of the ellipse
a and b are the respective vertices distances from center
we have
vertices at (7, 0) and (-7, 0)
co-vertices at (0, 1) and (0, -1)
so
The center is the origin (0.0) (The center is the midpoint of the vertices)
a=7
b=1
substitute


Answer:
c) 0.22
Step-by-step explanation:
<u>Explanation</u>:-
A random sample of 500 army recruits has a mean height of 68 inches with a standard deviation of 2.5 inches.
The sample size 'n' = 500
Given the mean of the sample = 68 inches
Given standard deviation = 2.5 inches

The 95% of confidence interval ∝ = 1.96

Margin of error = 0.2191 ≅0.22
<u>Conclusion</u>:-
The Margin of error at 95% of confidence intervals = 0.22
Willard F. Libby used Geiger M<span>üller tubes to date artifacts with known ages. </span>
Answer:
17. 290a for pizza / 5b for celary / 290a+5b=total calorie intake
18. 8.50a for adult tickets / 5.50c for children tickets / 8.50a+5.5c=total for tickets
The correct answer is.. 890
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