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4 years ago

Which choices correctly describe reflections in the diagram? Check all that apply.

Mathematics

2 answers:

inessss [21]4 years ago

8 0

Answer:

.................................................

fgiga [73]4 years ago

8 0

Answer:

2, 3, 4.

I don't have an explanation I just did the test.

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Write the equation of an ellipse with vertices at (7, 0) and (-7, 0) and co-vertices at (0, 1) and (0, -1).

Irina-Kira [14]

Answer:

$\frac{(x)^{2}}{49}+\frac{(y)^{2}}{1}=1$

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

$\frac{(x-h)^{2}}{a^{2}}+\frac{(y-k)^{2}}{b^{2}} =1$

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)

The center is the origin (0.0) (The center is the midpoint of the vertices)

a=7

b=1

substitute

$\frac{(x-0)^{2}}{7^{2}}+\frac{(y-0)^{2}}{1^{2}}=1$

$\frac{(x)^{2}}{49}+\frac{(y)^{2}}{1}=1$

8 0

3 years ago

A random sample of 500 army recruits has a mean height of 68 inches with a standard deviation of 2.5 inches. if a 95% confidence

Komok [63]

Answer:

c) 0.22

Step-by-step explanation:

Explanation:-

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

$Margin error = \frac{Z_{\alpha } S.D}{\sqrt{n} }$

The 95% of confidence interval ∝ = 1.96

$M.E = \frac{1.96 X 2.5}{\sqrt{500} }$

Margin of error = 0.2191 ≅0.22

Conclusion:-

The Margin of error at 95% of confidence intervals = 0.22

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3 years ago

What was the sensitive, well-insulated tool Willard F. Libby used to date artifacts with known ages?

miss Akunina [59]

Willard F. Libby used Geiger Müller tubes to date artifacts with known ages.

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4 years ago

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3 years ago

Researchers wanted to estimate how many lizards were living in a nearby wildlife preserve. The researchers went to the preserve

slava [35]

The correct answer is.. 890

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3 years ago