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3 years ago

Marcie can swim 20 laps in an hour. How many hours will it take her to swim 100 laps

Mathematics

2 answers:

ozzi3 years ago

7 0

Answer:

5 hours

Step-by-step explanation:

It takes Marcie 1 hour to swim 20 laps so to swim 100 laps divide by 20. 100/20=5

Margarita [4]3 years ago

4 0

Answer:

5 hours

Step-by-step explanation:

We can write a ratio

20 laps 100 laps

-------------- = --------------

1 hour x hours

Using cross products

20x = 100

Divide by 20

20x/20 = 100/20

x = 5 hours

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A person in the audience of a game show has a 12% chance of winning free movie tickets. What is the chance that a person in the

Leni [432]

There is a 88% chance that the person in the audience does not win free movie tickets.

Out of a 100% chance, there is 12% in winning the tickets. So, 100-12=88.
Answer: 88%

3 0

3 years ago

Is polygon always a plane figure?

Elanso [62]

Yes, polygons are always plane figures

5 0

3 years ago

Read the problem and answer the questions show your solution when necessary.

Alexandra [31]

Answer:

Step-by-step explanation:

1) Number of white chocolate bars = x

Number of dark chocolate bars = y

Total bars = 15

x + y = 15 --------------(I)

Total cost = Php. 340

20x + 25y = 340 ----------------(II)

2) We can use elimination method to solve this equations.

Multiply equation (I) by (-20) and then add the equations.

(I)* (-20) -20x -20y = - 300

(II) 20x + 25y = 340 {Now add and x will be eliminated}

5y = 40

y = 40/5

y = 8

Substitute y = 8 in equation (I)

x + 8 = 15

x = 15 - 8

x = 7

3) Number of dark chocolate bars = 8

4 0

3 years ago

Here's the question.

OleMash [197]

Answer:

The value of T₂₀ - T₁₅ is -20.

Step-by-step explanation:

Given :

>> If for an A.P, d = -4

To Find :

>> T₂₀ - T₁₅

Using Formula :

General term of an A.P.

$\star{\small{\underline{\boxed{\sf{\red{ T_n = a + (n - 1)d}}}}}}$

>> Tₙ = nᵗʰ term
>> a = first term
>> n = no. of terms
>> d = common difference

Solution :

Firstly finding the A.P of T₂₀ by substituting the values in the formula :

${\dashrightarrow{\pmb{\sf{ T_n = a + (n - 1)d}}}}$

${\dashrightarrow{\sf{ T_{20} = a + (20 - 1) d}}}$

${\dashrightarrow{\sf{ T_{20} = a + (19)d}}}$

${\dashrightarrow{\sf{ T_{20} = a + 19 \times d}}}$

${\dashrightarrow{\sf{ T_{20} = a + 19d}}}$

${\star \: {\underline{\boxed{\sf{\pink{ T_{20} = a + 19d}}}}}}$

Hence, the value of T₂₀ is a + 19d.

$\rule{190}1$

Secondly, finding the A.P of T₁₅ by substituting the values in the formula :

${\dashrightarrow{\pmb{\sf{ T_n = a + (n - 1)d}}}}$

${\dashrightarrow{\sf{ T_{15}= a + (15 - 1) d}}}$

${\dashrightarrow{\sf{ T_{15}= a + (14) d}}}$

${\dashrightarrow{\sf{ T_{15}= a + 14 \times d}}}$

${\dashrightarrow{\sf{ T_{15}= a + 14d}}}$

${\star{\underline{\boxed{\sf \pink{ T_{15}= a + 14d}}}}}$

Hence, the value of T₁₅ is a + 14d

$\rule{190}1$

Now, finding the difference between T₂₀ - T₁₅ :

${\dashrightarrow{\pmb{\sf{T_{20} - T_{15}}}}}$

${\dashrightarrow{\sf{(a + 19d) - (a + 14d)}}}$

${\dashrightarrow{\sf{a + 19d - a - 14d}}}$

${\dashrightarrow{\sf{a - a + 19d - 14d}}}$

${\dashrightarrow{\sf{0+ 19d - 14d}}}$

${\dashrightarrow{\sf{19d - 14d}}}$

${\dashrightarrow{\sf{5 \times - 4}}}$

${\dashrightarrow{\sf{ - 20}}}$

${\star \: \underline{\boxed{\sf{\pink{T_{20} - T_{15} = - 20}}}}}$

Hence, the value of T₂₀ - T₁₅ is -20.

$\underline{\rule{220pt}{3.5pt}}$

3 0

2 years ago

What is the answer for the equation 4|x+1/3|=20 ?

Llana [10]

I hope this helps you...

6 0

3 years ago

Read 2 more answers