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3 years ago

If A(2,4) is reflected over the x-axis, what are it’s new coordinates ?

Mathematics

1 answer:

Sav [38]3 years ago

3 0

Answer:

(2,-4)

Step-by-step explanation

When you reflect a point across the x-axis, the x-coordinate remains the same, but the y-coordinate is transformed into its opposite (its sign is changed). If you forget the rules for reflections when graphing, simply fold your paper along the x-axis (the line of reflection) to see where the new figure will be located.

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horrorfan [7]

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Step-by-step explanation:

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2 years ago

The difference of d minus 3 divided by 2?

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$\text{Hey there!}$

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2 years ago

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Olegator [25]

Takes an hour for B to catch up to A.

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2 years ago

Miguel is going for a walk. he takes 3 hours to walk 7.5 miles. what is his speed?

daser333 [38]

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7 0

3 years ago

Read 2 more answers

A cookie factory monitored the number of broken cookies per pack yesterday.

trapecia [35]

Answer:

Confidence Interval - 2.290 < S < 2.965

Step-by-step explanation:

Complete question

A chocolate chip cookie manufacturing company recorded the number of chocolate chips in a sample of 50 cookies. The mean is 23.33 and the standard deviation is 2.6. Construct a 80% confidence interval estimate of the standard deviation of the numbers of chocolate chips in all such cookies.

Solution

Given

n=50

x=23.33

s=2.6

Alpha = 1-0.80 = 0.20

X^2(a/2,n-1) = X^2(0.10, 49) = 63.17

sqrt(63.17) = 7.948

X^2(1 - a/2,n-1) = X^2(0.90, 49) = 37.69

sqrt(37.69) = 6.139

s*sqrt(n-1) = 18.2

$s\sqrt{\frac{n-1}{X^2 _{(n-1), \frac{\alpha }{2} } }$ $\leq \sigma \leq s\sqrt{\frac{n-1}{X^2 _{(n-1), 1-\frac{\alpha }{2} } }$

confidence interval:

(18.2/7.948) < S < (18.2/6.139)

2.290 < S < 2.965

8 0

2 years ago