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3 years ago

Homework Question Help

Mathematics

1 answer:

harkovskaia [24]3 years ago

5 0

Answer:

A=49 degrees

a= 41 degrees

b=90 degrees

Step-by-step explanation:

its asking for the degrees?

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HELPPP PLZZZ :/

horsena [70]

Answer:

It should be obtuse or isosceles but theres no answer for isosceles so put obtuse

7 0

3 years ago

Read 2 more answers

A frustum is made by removing a small cone from a similar larger cone. Work out the volume of the frustum, Below

Margarita [4]

Answer:

732×pi cm³

Step-by-step explanation:

we have all the data and the formula.

so, we only need to do the raw calculations.

Vc = pi×r²×h/3

r = the radius of the basic circle

h = the height.

since the volume of the frustum is the volume of the large cone minus the volume of the small cone, we need to calculate both volumes and then subtract the smaller from the larger number.

oh, and we need to calculate also the radius of the base circle of the small cone. since they are similar bodies, all lines use the same ratio or scaling factor to convert from one cone to the other.

that includes height and radius.

we know the height of the large cone is 16+4=20 cm.

and set know that the height of the small cone is 16 cm.

so, the scaling factor is 16/20 = 4/5 to go from the large to the small cone.

that means that the radius of the small cone is

15 × 4/5 / 3×4 = 12 cm

so, now to the 2 cone volumes :

the large cone

Vcl = pi×15²×20/3 = pi×225×20/3 = pi×75×20 =

= pi×1500 cm³

the small cone

Vcs = pi×12²×16/3 = pi×144×16/3 = pi×48×16 =

= pi×768 cm³

the volume of the frustum is therefore

Vf = Vcl - Vcs = 1500×pi - 768×pi = 732×pi cm³

7 0

3 years ago

The diameter of a spindle in a motor is supposed to be 40 mm with standard deviation of 0.5 mm. If the spindle is either too sma

grandymaker [24]

Answer:

It can be used the confidence interval to check the idea.

The confidence interval tells us that the real mean is expected to be between 40.2 and 40.4, with a 95% of confidence.

We can conclude that the mean diameter has moved away from the target value.

Step-by-step explanation:

A method to determine wether the mean diameter has moved away from the target is to calculate a confidence interval over the mean.

This would let us know if the real mean diameter could be 40 mm or not.

If the confidence interval does not include the value 40 mm, we can claim that the mean diameter has moved from the target value.

We will calculate a 95% confidence interval (CI), for which the z-value is z=1.96.

The margin of error is:

$E=z*\sigma/\sqrt{n}=1.96*0.5/\sqrt{100}=0.098\approx 0.1$

Then, the upper and lower limits of the CI are:

$UL=\bar x+z*\sigma/\sqrt{n}=40.3+0.1=40.4\\\\\\ LL=\bar x-z*\sigma/\sqrt{n}=40.3-0.1=40.2$

The confidence interval tells us that the real mean is expected to be between 40.2 and 40.4, with a 95% of confidence.

We can conclude that the mean diameter has moved away from the target value.

8 0

4 years ago

Help me plz....Thanks

liraira [26]

Answer:

it is about 34 days

Step-by-step explanation:

divide the weight by the age for each kitten, you have a number called H

for example: kitten 1 has H1 = 600/50=12, kitten has H2 =340/28=85/7,kitten 3 has H3= 480/42= 80/7,...

find the arithmetic mean K of those number

K = (H1+H2+...+H8)/8 ≈ 13,44

so the age of the abandoned kitten is 460/13,44 ≈ 34,2 days

4 0

3 years ago

Read 2 more answers

Does anyone know this answer?

solmaris [256]

Answer:

0.111111…

Step-by-step explanation:

In the problem described, we understand that 1 in 9 friends prefer kiwi.

That's the equivalent of $x = \frac{1}{9}$ which is equal to $0.1111111...$

Please let me know if you have any questions in the comments.

Have fun studying! :)

6 0

3 years ago