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wolverine [178]
3 years ago
8

There are 8 different cell phones in total.You want to buy two cell phones. In how many ways can a group of two cell phones

Mathematics
1 answer:
timurjin [86]3 years ago
4 0

Answer:

36

Step-by-step explanation:

I would label the 8 different cellphones: A, B, C, D, E, F, G, H.

Here is a list of all the possible ways to group these letters together, starting with A then B, and so on:

ab     bc     cd     de     ef     fg     gh

ac     bd     ce     df     eg     fh

ad     be     cf     dg     eh

ae    bf       cg    dh

a f     bg     ch

ag     bh

ah

As you can see, the number of pairs going from left to right decreases by one every column all the way until 1. Note that any two letters that are reversed does not make it a new combination.

Total number of ways a group of two cell phones can be selected =

8+7+6+5+4+3+2+1 = 36!

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Oksana_A [137]

9514 1404 393

Answer:

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Step-by-step explanation:

The equation for the perimeter of the rectangle is ...

  P = 2(L+W)

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Solving for m, we get

  m = 17 -n . . . . . . . divide by 2, subtract n

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The Pythagorean theorem gives the relationship between the sides and the hypotenuse

  m^2 +n^2 = (n+1)^2

  (17 -n)^2 +n^2 = (n +1)^2 . . . . . . substitute for m

  289 -34n +n^2 +n^2 = n^2 +2n +1 . . . . eliminate parentheses

  n^2 -36n +288 = 0 . . . . . . . put in standard form

  (n -12)(n -24) = 0 . . . . . . . . . factor

  n = 12 . . . . . . . . . . n=24 is an extraneous solution here

The value of n is 12 cm.

8 0
3 years ago
Find the area of each figure. Use 3.14
madreJ [45]
I think its 18.24 because if you multiply it by 3.14 then subtract u should get 18.24
7 0
3 years ago
HELLP ASAP
Natali [406]
B, D, A
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4 0
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A cylinder has a base diameter of 16 feet and a height of 19 feet. What is its volume in cubic feet, to the nearest tenths place
Tresset [83]

Answer: Volume = 3818.2 cubic feet

Step-by-step explanation:

The formula for determining the volume of a cylinder is expressed as

Volume = πr²h

Where

r represents the radius of the cylinder.

h represents the height of the cylinder.

π is a constant whose value is 3.14

From the information given,

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Therefore,

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6 0
3 years ago
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liberstina [14]

Answer:

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Step-by-step explanation:

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8 0
2 years ago
Read 2 more answers
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