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3 years ago

An expression is given.

Mathematics

1 answer:

igomit [66]3 years ago

4 0

Answer:

None of those

Step-by-step explanation:

$a) -1xy + 74 \neq -2y + 32 x + 74\\\\ b) 32x - 2(y + 72) = 32x -2y -144\\32x -2y -144 \neq -2y + 32 x + 74\\ \\ c) -14y + 32(y +x) = -14y + 32y+32x \\ -14y + 32y+32x\neq-2y + 32 x + 74\\ \\d) -2y + 12 (3x + 72) = -2y + 36x+864\\-2y + 36x+864\neq -2y + 32 x + 74\\ \\e) 14(-8y + 6x + 7) = -112y +84x+98\\ -112y +84x+98 \neq -2y + 32 x + 74$

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A sample of 1800 computer chips revealed that 53% of the chips do not fail in the first 1000 hours of their use. The company's p

charle [14.2K]

Answer:

So the value of the test statistic is -0.85.

Step-by-step explanation:

We know that a sample of 1800 computer chips revealed that 53% of the chips do not fail in the first 1000 hours of their use. The company's promotional literature states that 54% of the chips do not fail in the first 1000 hours of their use.

We get that:

$n=1800\\\\p_1=53\%=0.53\\\\p_2=54\%=0.54\\$

We calculate the standar deviation:

$\sigma=\sqrt{\frac{0.53 \cdot (1-0.53)}{n}}=\sqrt{\frac{0.53 \cdot 0.47}{1800}}=0.01176$

We calculate the value of the test statistic:

$z=\frac{p_1-p_2}{\sigma}=\frac{0.53-0.54}{0.01176}=-0.85$

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3 years ago

Which of the following is the number of sides for a regular polygon that will not form a regular tessellation?

trasher [3.6K]

Answer with explanation:

A regular polygon is simple closed geometrical shape, only made up of line segments.

And Regular Tessellation, is geometrical shape, made up of regular polygons having, 3 ,or 4 or 6 sides.

It is combination of, only single kind of polygon,either, polygon having 3 sides, or ,4 sides or 6 sides.

→Regular polygon having 3 sides is Called Equilateral Triangle.

→Regular polygon having 4 sides is Called Square.

→Regular polygon having 6 sides is Called Regular Hexagon.

⇒Regular polygon having , 8 sides will not form a regular tessellation.

Option D

6 0

3 years ago

marcela's dog gained 4.1 kilograms in two months. two months aga the dog's mass was 5.6 kilograms. what is the dog's current mas

Oksana_A [137]

5.6+4.1=9.7 The dog is now 9.7 kg.

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3 years ago

Read 2 more answers

meteroloogist track severe stoms using Doppler radar. A polar grid is used to measure distances as the storms progress. If the c

FinnZ [79.3K]

Answer:

$(x-h)^2+(y-k)^2= (r+ 40 )^2$

Step-by-step explanation:

It is given that a meteorologist is using a Doppler radar to find out the distance of the storm as it passes using a polar grid.

The origin of the radar screen is its center.

And the distance between each ring is 10 miles from the center.

So let :

r = radius

h and k = be the coordinates of the center.

So the equation of a circle is :

$(x-h)^2+(y-k)^2= r^2$

Now the equation of the fourth circle when the radius changes by 10 miles is :

$(x-h)^2+(y-k)^2= (r+ 40 )^2$

5 0

3 years ago

PLEASE HELP ASAP!!!!!!

Katena32 [7]

1. - Since a cube is all the same lengths on all sides you would want to find the area of one of the sides. You would do this by multiplying 3.8 by 3.8.
3.8*3.8=14.44
Since you have six faces on a cube you want to multiply this by 6.
14.44*6=86.64
So your answer for 1. is 86.64 in^2 of glass

3. Same thing as number one. Find the face of one side:
1 1/3*1 1/3 is about 1.7777
Multiply this by the six faces.
1.7777*6 is about 10.66666
So your answer for 3. is about 10.666 (repeating) in^2

4. For this one, you want to follow the surface area formula for a cylinder. Which is - A=2πrh+2πr^2
When you put all your numbers in it would look like this:
2*3.14*2*22+2*3.14*2^2
Once you do that equation you will get 301.44
So that should be your answer 301.44 cm^2

Hope this helps!

8 0

3 years ago