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Diano4ka-milaya [45]
3 years ago
15

HELP HELP HELP

Mathematics
1 answer:
Law Incorporation [45]3 years ago
3 0

Based on her results, if she flipped the coins another 50 times, she should expect to flip heads 20 times. If Jessica flips a coin 100 times and gets 40 times heads and the next time she flips a coin 50 times she should get 20 because, 100 divide 2 is 50 so you would have to divide 40 with 2 and get the answer of 20.

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Answer:

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Step-by-step explanation:

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3 years ago
A number increased by 100% and decreased by 20% is x. what is the number ? NEEDED TODAY
vodka [1.7K]

Answer:

Let's assume the number be 100.

According to the problem , 100 is increased by 100%.

So, new number will be 100+100=200

Now 200 will decreased by 20%.

So, 20% of 200= 0.20*200= 40.

So, again the number has been changed into 200+40=240.

So, x=240

Step-by-step explanation:

5 0
3 years ago
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A piece of carpet is in the shape of an isosceles trapezoid with a height of 30 inches and bases 40 and 60 inches. What is the a
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3 years ago
If a car is traveling at 120 km/s within 120 min, what is its distance? (Remember: 60 seconds = 1 min. 120 km = 120,000 m) *
Nitella [24]

Answer:

d=864\times 10^6\ m

Step-by-step explanation:

Given that,

Speed of a car, v = 120 km/s

It takes 120 minutes

v = 120000 m/s

t = 7200 s

We need to find the distance covered. Speed is given by :

v = distance/time

d=v\times t\\\\d=120000\ m/s\times 7200\ s\\\\d=864\times 10^6\ m

So, the distance covered is 864\times 10^6\ m.

3 0
3 years ago
The perimeter of a rectangle is equal to 40. If the length is halved and the width is divided by 3, the new perimeter is decreas
Tanzania [10]

Answer:

8

Step-by-step explanation:

<em>   M = Original perimeter = 40</em>

<em>    M = 2 w + 2 l = 2 ( w + l )</em>

<em>           40 = 2 ( w + l )</em>

Divide both sides by 2 (simplify)

<em>                20 = w + l</em>

<em>                w + l = 20</em>

Subtract w from both sides

<em>        w + l - w = 20 - w</em>

<em>             l = 20 - w</em>

If the length is halved and the width is divided by 3 mean:

          <em>New length l1 = l / 2 = ( 20 - w ) / 2 = 10 - w / 2</em>

<em>                       New width w1 = w / 3</em>

The new perimeter is decreased by 24 mean:

        <em> P1 = New perimeter = 40 - 24 = 16</em>

<em>             P1 = 2 w1 + 2 l1 = 2 ( w1 + l1 )</em>

<em>                    16 = 2 ( w1 + l1 )</em>

Divide both sides by 2

           8 = w1 + l1

            w1 + l1 = 8

             w / 3 + 10 - w / 2 = 8

 Subtract 10 to both sides

           w / 3 + 10 - w / 2 - 10 = 8 - 10

             w / 3 - w / 2 = - 2

               2 w / 6 - 3 w / 6 = - 2

                 - w / 6 = - 2

Multiply both sides by - 6

       ( - 6 ) ∙ ( - w / 6 ) = ( - 2 ) ∙ ( - 6 )

                w = 12

                   l = 20 - w = 20 - 12 = 8

Proof:

Original perimeter:

        <em>P = 2 w + 2 l = 2 ( w + l ) = 2 ∙ ( 12 + 8 ) = 2 ∙ 20 = 40</em>

New length:

       <em>l1 = l / 2 = 8 / 2 = 4</em>

New width:

        <em>w1 = w / 3 = 12 / 3 = 4</em>

New rectangle will be the square. ( the square is a special case of the rectangle )

New perimeter:

      <em>P1 = 2 w1 + 2 l1 = 2 ( 4 + 4 ) = 2 ∙ 8 = 16</em>

The length of the original rectangle:

                                <u>l = 8</u>

                            <u>Answer 2</u>

5 0
3 years ago
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