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Aneli [31]
3 years ago
13

In a toy factory 200 wooden solid cylinder 7cm long and 35mm in diameter have to be painted. What is the total surface area in c

m^2 that needs to be painted?
Mathematics
1 answer:
Semmy [17]3 years ago
5 0
The surface area of a cylinder is:

A=2pr^2+2prh  and since r=d/2

A=2p(d^2/4+dh/2)

A=(p/2)(d^2+2dh)  and we need 200 of these cylinders...

A=(100p)(d^2+2dh), and using d and h, 3.5cm and 70cm we get:

A=(100p)(3.5^2+2*3.5*7)

A=(100p)(12.25+49)

A=6125p cm^2

A≈19242 cm^2 (to nearest cm^2)
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Someone help asap please, thanks!
Sever21 [200]
Graph B is the correct answer
7 0
3 years ago
What is the equation of the line that contains the point (-1, 4) and has a slope of 3?
sertanlavr [38]

Let's write the equation with formula:-

\boxed{ \sf \: formula : y -y_{1} =  m(x -  x_{1})}

Where,

  • x1 is -1 and y1 is 4 and m is 3

\tt \: y - 4= 3(x - ( - 1))

\tt \: y  - 4 = 3(x + 1)

\tt \: y  - 4 = 3x + 3

\tt \: y = 3x + 3 + 4

\tt \: y = 3x + 7

<em>Thus, The correct choice is option C!!~</em>

4 0
2 years ago
Read 2 more answers
At a large company banquet for several thousand employees and their families, many of the attendees became ill the next day. The
yan [13]

Answer:

a. Yes.  This provides convincing evidence that the true proportion of all attendees who ate the fish that got sick (80%) is more than the true proportion of all attendees who did not eat the fish that got sick.

b. The mistake here would have been the rejection of the Doctor's theory or hypothesis to the effect that more attendees who ate the fish got sick than those who did not eat the fish. This is a Type 1 error.   A Type 1 error occurs when a null hypothesis is rejected when it is true. On the other hand, a Type II error occurs when the null hypothesis is accepted when it should be rejected.  While a Type I error is equivalent to a false positive, a Type II error is equivalent to a false negative.

Step-by-step explanation:

Total number of attendees who ordered fish = 1,000

Sample size of the attendees who ate fish = 80

Number of attendees who ate the fish and got sick = 64 (80% or 64/80)

Sample size of attendees who did not eat fish = 60

Number of attendees who did not eat fish and got sick = 39 (65% or 39/60)

4 0
2 years ago
Solve for X<br> 5x + 2 = 7x – 4
Anna71 [15]
X = -3

I’m not sure if that’s correct but hope that helps :)
8 0
2 years ago
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irinina [24]
The answer is b, 9 was distributed to only one to m, when it needs to be distributed to both.
5 0
2 years ago
Read 2 more answers
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