All categories

2 years ago

Which of the following decimal representations is an example of a rational number?

Mathematics

1 answer:

STALIN [3.7K]2 years ago

8 0

B because the line over the 28 means that it’s repeating and a repeating decimal = rational number example : 27.67777777 is a rational number because it’s repeating and an irrational number would be 27.6719473637

You might be interested in

Plz help guys! I will mark everyone who answers correctly for each one! Plz!

ryzh [129]

Answer:

Let's say that x is sam's age and y is Amy's age

x=y-4

and five years ago:

x-5=(y-5)/2

y-4-5=(y-5)/2

2y-18=y-5

y=13

x=9

then:

sam's age is 9 and Amy's age is 13

5 0

2 years ago

Read 2 more answers

One of your friends is testing the effect of drinking coffee on the duration of cold symptoms. The common cold lasts, on average

Nonamiya [84]

Answer:

0.0930

Step-by-step explanation:

Given that one of your friends is testing the effect of drinking coffee on the duration of cold symptoms. The common cold lasts, on average, 6 days.

she tests a one-sided alternative about the population mean cold duration when drinking coffee, H0: μcoffee = 6 Ha: μcoffee < 6 She finds z = −1.68 with one-sided P-value P = 0.0465.

If hypotheses changed to two tailed as:

$H_0: \mu_{coffee} = \mu_{tea}\\H_a: \mu_{coffee}\neq \mu_{tea}$

(Two tailed test)

Since we have mean difference and std error the same, test statistic would remain the same.

p value for two tailed would be = twice the p value for one tail

= $2(0.0465)\\= 0.0930$

6 0

3 years ago

In 1992, Jason bought a gallon of gas for $1.17. Yesterday, he bought a gallon of gas for $2.19. What is the percentage increase

sergeinik [125]

It’s 87.2 c
I used calculator soup

5 0

3 years ago

Read 2 more answers

If the probability of selecting, without replacement, 2 red marbles from a bag containing only red and blue marbles is 3 55 and

Marat540 [252]

Answer:

Step-by-step explanation:

Let T = the TOTAL number of marbles in the bag.

We are told that 3 of those marbles are red

P(select a red marble first) = 3/T

Once we've removed the first red marble, there are T-1 marbles remaining and 2 of them are red

So, P(select a red marble second) = 2/(T-1)

Okay, now let's use probability rules to answer the question....

P(select 2 red marbles) = P(select a red marble first AND select a red marble second)

= P(select a red marble first) x P(select a red marble second)

= 3/T x 2/(T-1)

= 6/(T² - T)

We're told that P(select 2 red marbles) = 3/55

So, we can write: 6/(T² - T) = 3/55

Cross multiply to get: 3(T² - T) = (6)(55)

Divide both sides by 3 to get: T² - T = (2)(55)

Evaluate: T² - T = 110

Rearrange: T² - T - 110 = 0

Factor: (T - 11)(T + 10) = 0

So, EITHER T = 11 OR T = -10

Since T cannot be negative, it must be the case that T = 11

6 0

2 years ago

Evaluate (tan 60)(cos 45)

loris [4]

Answer: the tan. Of 60 is .3200

The cos. Of 45 is .5253

Hope this helps :)

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers