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3 years ago

If you roll a number cube 18 times, about how many times would you expect to roll a 4?

1 answer:

7 0

Rolling a 4 is has 1/6 chance of happening, since a cube has 6 sides. And since you are rolling the dice 18 times, you can expect it to land once every 6 rolls, so it's 18/6 which equals 3

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Mel and Kenneth went to refinish the community center gym floor. The rectangular floor is 15.2m wide and 25.6m long. If each gal

elena-14-01-66 [18.8K]

Mel and Kenneth should buy 3 gallons.

7 0

4 years ago

If the variance of the data values in a population is 289, what is the standard

liq [111]

Answer:

Step-by-step explanation:

Variance=(standard deviation)^2

√289=standard deviation

Standard deviation=17

8 0

3 years ago

Iodine-125 has a half-life of about 60 days. How many milligrams of a 1000mg sample will remain after 240 days?

Bezzdna [24]

62.5 mg sample will remain after 240 days

Step-by-step explanation:

Given

Half-life = T = 60 days

The formula for calculating the quantity after n half lives is given by:

$N = N_0(\frac{1}{2})^n$

Here

N is the final amount

N_0 is the initial amount

n is the number of half lives passed

The number of half lives are calculated by dividing the time for which the remaining quantity has to be found by half life

The quantity has to be calculated for 240 days so,

$n = \frac{240}{60}\\n = 4$

Given

$N_0 = 1000\ mg$

Putting the values in the formula

$N = 1000 (\frac{1}{2})^4\\=1000 * \frac{1}{16}\\=\frac{1000}{16}\\=62.5\ mg$

Hence,

62.5 mg sample will remain after 240 days

Keywords: Half-life, sample

Learn more about half-life at:

#LearnwithBrainly

4 0

4 years ago

Barbara Bailey joined a bowling league. She paid a $18.00 entry fee plus $7.50 a week for 16 weeks. She purchased a bowling ball

larisa [96]

If you add them all up it comes out to $339.94

7 0

4 years ago

Read 2 more answers

Carla's team won 3 of its 5 games. Elena's team won games at the same rate and won 12 games. How many games did Elena's team pla

Maurinko [17]

This is all about proportions. You can make this into fractions:

3/5 = 12/x

A good way to handle this, is to make one of those numbers the same. If you do (3/5) * 4, you would get 12/20 (because 4 * 3 = 12 and 4 * 5 = 20)

So then you have this:

12/20 = 12/x

It's basically a fill in the blank from there. x= 20

Elena's team played 20 games

4 0

4 years ago

Read 2 more answers