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aksik [14]
3 years ago
8

Which side lengths cannot form a triangle? Select all that apply.

Mathematics
1 answer:
jarptica [38.1K]3 years ago
5 0

7cm,8cm,13cm

16cm,4cm,18cm

11cm,21cm,13cm

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if A and B together can do a piece of work in 10 days and B along can do it in 15 days, how many part of the work does A complet
anzhelika [568]

Answer:

1/5

Step-by-step explanation:

Well work can be defined as: work = rate \ *\ time

where rate=amount of work that can be done in one unit of time

let a = rate of work A does in a day

let b = rate of work B does in a day

this means that: 10a + 10b=1 where work=1 and it just means the entire job has been completed.

Since b can do it alone in 15 days, this means that: 15b=1

If we divide by 15 here, we get the equation: b=\frac{1}{15}

We can now use this definition to substitute it into the first equation we made.

10a + 10(\frac{1}{15}) = 1

Multiply the 10 and 1/15

10a+\frac{2}{3}=1

subtract 2/3 from both sides

10a=\frac{1}{3}

Now divide both sides by 10

a=\frac{1}{30}

Now multiply this by 6, since we a represents the amount of work that can be done in a day, we want to find how many parts of the work can be done by a in 6 days

6a=\frac{6}{30}

Now divide both the numerator and denominator by 6

a=\frac{1}{5}

8 0
2 years ago
The volume of a cube is 27 cubic meters.<br> What is its surface area, in square meters?
stiks02 [169]

Step-by-step explanation:

the volume of a cube is

side³.

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the surface area is 6 squares of 3×3 = 9m², so in total

9 × 6 = 54 m²

8 0
2 years ago
There are two connected gears. One has 60 teeth and it makes 50 complete revolutions in a minute. How many complete revolutions
VikaD [51]

60/40 *50 = 75

75 revolutions

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Andrea deposited 138 dollars into er bank accont.write an expression representing Andrea's bank account.
marin [14]

Answer:

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Step-by-step explanation:

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2 years ago
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tamaranim1 [39]

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B

Step-by-step explanation:

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