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3 years ago

HELP HELP HELP

1 answer:

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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Y_Kistochka [10]

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

Read 2 more answers

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

yaroslaw [1]

30x40x60=72,000. with area you do LxWxH

3 0

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:

Step-by-step explanation:

M = Original perimeter = 40

M = 2 w + 2 l = 2 ( w + l )

40 = 2 ( w + l )

Divide both sides by 2 (simplify)

20 = w + l

w + l = 20

Subtract w from both sides

w + l - w = 20 - w

l = 20 - w

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

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

New width w1 = w / 3

The new perimeter is decreased by 24 mean:

P1 = New perimeter = 40 - 24 = 16

P1 = 2 w1 + 2 l1 = 2 ( w1 + l1 )

16 = 2 ( w1 + l1 )

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:

P = 2 w + 2 l = 2 ( w + l ) = 2 ∙ ( 12 + 8 ) = 2 ∙ 20 = 40

New length:

l1 = l / 2 = 8 / 2 = 4

New width:

w1 = w / 3 = 12 / 3 = 4

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

New perimeter:

P1 = 2 w1 + 2 l1 = 2 ( 4 + 4 ) = 2 ∙ 8 = 16

The length of the original rectangle:

l = 8

Answer 2

5 0

3 years ago