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Lilit [14]
2 years ago
15

A solid cylinder has a radius of 2 cm and a height of 7 cm. It has a density of 3.1 grams

Mathematics
1 answer:
timurjin [86]2 years ago
5 0

Answer:

Step-by-step explanation:

The first thing you need to do is find the volume.

r = 2cm

h = 7 cm

pi = 3.14

V = pi*r^2 *h

V = 3.14 * 2^2 * 7

V = 3.14 * 4 * 7

V = 87.92 cm^3

Next find the mass using the density formula

Density = mass / volume

Density = 3.1 grams / cm^3

Volume = 87.92 cm^3

3.1 = m / 87.92               Multiply both sides by 87.92

3.1 * 87.92 = m

m = 272.55

Note:

Technically There should be no decimal places. 3.1 is only 2 significant digits. The answer should be 270 grams.

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Show that in a group of five people (where any two people are either friends or enemies), there are not necessarily three mutual
sveta [45]

Answer:

Lets call the people A,B,C,D and E. We need to find an example where there are not 3 mutual friends and not three mutual enemies.

Lets start by assuming that A has 2 friends, B and C, and 2 enemies, D and E.

Since we want A,B and C not to be mutually friends, then B and C neccesarily have to be enemies.

Now, since B and C are enemies, they cant be enemies at the same time with D, and they also cant be enemies at the same time with E. Therefore one of them has to be friends with D and one has to be friends with E.

Also, since D and E are enemies with A, they neccesarily need to be friends.

From the fact that D and E are friends, we coclude that they cant have a friend in common, as a consequence, B has to be friends with one of D and E and C has to be friend with the other. We can assume that B is friend with D and C is friend with E. If we use that, we have the following friendship configuration

---------------------

Friends of A: B, C

Enemies of A: D,E

-------------------------

Friends of B: A,D

Enemies of B: C, E

------------------------

Friends of C: A,E

Enemies of C: B,D

------------------------

Friends of D: B,E

Enemies of D: A,C

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Friends of E: C,D

Enemies of E:  A,B

--------------------------

As you can check, there is not three mutual friends nor three mutual enemies.

8 0
3 years ago
Marcus changed jobs after college. His old salary was $48000 per year. Now his new salary is 37% more per year. What is his new
Gennadij [26K]

Answer:

65,760

Step-by-step explanation:

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2 years ago
a store sold a case of scented candles for$17.85 that had been marked up 110%. what was the original price
densk [106]
If 10% was added to the total (100%), then subtract 10% from 17.85.

17.85 * 0.1 = 1.785
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6 0
3 years ago
Start with the number 5,835.87 make 3 more in the tens place
Vinil7 [7]

So the tens place for this number would be the 3 for "30." It wants 3 more in the tens place, so I think it wants you to add 3 tens to make it 60, or a grand total 5,865.87. It's worded a little funny, so if you think it's something else please tell!

4 0
3 years ago
Read 2 more answers
WILL GIVE BRAINLIEST! DUE TODAY! WILL GIVE EVERYTHING GOOD!!! HELPP!!! I REALLY NEED HELP ON THIS ONE!!!!
PtichkaEL [24]

Answer:

So its pretty simple

The table provided the Xs so you can just substitute the x in the eqaution becuase the eqaution gives you Y and your looking for Y.

For the first one

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So Y is 15

DO the same for the others

Also I think your rate of change is wrong, I think it’s -3/4 but your choice really, I might be wrong

6 0
2 years ago
Read 2 more answers
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