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3 years ago

I don't Understand 5 plz someone help me :(

Mathematics

1 answer:

ryzh [129]3 years ago

8 0

What point represent point p after a 90degree counter clockwise turn from the origin.

To solve, draw a line from the origin to point p. Draw a line from the origin that is perpendicular to line OP (origin to p). Make sure the line is in the counterclockwise direction, This will leave you at point ___
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Go down if you still don't understand\/

Point A

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A simple random sample of 20 third-grade children from a certain school district is selected, and each is given a test to measur

ICE Princess25 [194]

Answer:

Option C) 5.62 points

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 20

Sample mean score = 64

Sample standard deviation, s = 12

Degree of freedom =

$=n-1\\=20-1\\=19$

We have to calculate margin of error for a 95% confidence interval.

Formula for margin of error:

$t_{critical}\times \displaystyle\frac{s}{\sqrt{n}}$

Putting the values, we get,

$t_{critical}\text{ at degree of freedom 19 and}~\alpha_{0.05} = \pm 2.093$

$2.093\times (\displaystyle\frac{12}{\sqrt{20}} )\\\\ =5.6161\approx 5.62$

Thus, the correct answer is

Option C) 5.62 points

4 0

3 years ago

A theater teacher buys 99.75 yards of fabric to make costumes for the students. If each costume needs 4.75 yards of fabric, how

sertanlavr [38]

21 she can make 21 more simple
$99.75 \div 4.75$

4 0

3 years ago

the original plan for mr Harris's house is a rectangle that measures 40ft by 50ft. because of the increase and cost of materials

Sloan [31]

Answer: The dimesions will be decreased by 13.05%.

Step-by-step explanation:

Hi, we have to calculate the original area.

Area of a rectangle = Length x width

Replacing with the values given:

A = 40x50 = 2000 ft2

Since is reduced to 1739. if we multiply the original area by a the percentage decrease, and subtract that value to the original area, we obtain 1739 ft2.

2000 - (2000x) = 1739

Solving for x

-2000x = 1739 -2000

-2000x = -261

x =-261/-2000

x = 0.1305

Multiply by 1000 to obtain the percentage:

0.1305 x 100 = 13.05%

6 0

3 years ago

When the siren sounded, 440 were seen walking in the forest. If the other 360 were not seen, what fraction of the total was seen

melomori [17]

Fraction of the total was seen=(number of people were seen ) /(Total number of people)

Data:
number of people were seen=440
Total number of people=people saw +people didn´t see=440+360=800

Fraction of the toatal was seen=440/800=11/20

Answer: 11/20.

7 0

3 years ago

Read 2 more answers

The equations below are. parallel perpendicular or neither

Molodets [167]

Answer:

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

Rearrange both equations into this form

x - 6y = - 30 (subtract x from both sides )

- 6y = - x - 30 ( divide all terms by - 6 )

y = $\frac{1}{6}$ x + 5 ← in slope- intercept form

with slope m = $\frac{1}{6}$

y = - 6x + 5 ← in slope- intercept form

with slope m = - 6

Parallel lines have equal slopes.

Clearly the lines are not parallel.

The product of the slope of perpendicular lines equals - 1, thus

$\frac{1}{6}$ × - 6 = - 1

Hence the lines are perpendicular → b

7 0

3 years ago