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3 years ago

Hi if someone can answer the top one I’ll mark u brainliest thanks

Mathematics

2 answers:

Kryger [21]3 years ago

6 0

Answer:

the answer is a

Step-by-step explanation:

i got corrected :)

professor190 [17]3 years ago

5 0

Answer:

A.) 8 1/4 !!

Step-by-step explanation:

2.75 x 3 = 8.25

8 1/4

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The tortoise and the hare are in a road race to defend the honor of their breed. the tortoise crawls the entire 1000. m distance

jolli1 [7]

The tortoise crawls the whole 1000 m at 0.2 m/s, therefore, you must divide the distance by the rate of travel to find the time it took to complete the race. This gives us a time of 5,000 seconds to crawl the thousand meters. The hare runs the first 200 meters at 2 m/s, meaning that takes 100 seconds. The last 800 meters divided by the speed of 3 m/s gives us a time of 266 seconds. These two numbers must be added to the hare's rest time, converted from 1.3 hours into seconds by multiplying that number by 60 (for minutes in an hour) then 60 again (for seconds in a minute). 1.3 hours is equal to 4680 seconds. Therefore, the whole race took the hare 5,046 seconds, making it slightly slower than the hare, who finished in 5,000 seconds flat.

5 0

3 years ago

Is this statement true or false -7 -2 > 6 - 14

exis [7]

Answer:

false

Step-by-step explanation:

(-7-2) > (6-14)

-7-2 = -9

6-14 = -8

-9 is not > -8, because -9 is farther to the left on a number line. So, this statement would be false.

6 0

2 years ago

PLEASE HELP!!

Andre45 [30]

Answer:

I think the answer is c

Step-by-step explanation:

Because it says at most? am I right

8 0

3 years ago

Read 2 more answers

At Mr. Hynd's ranch, there are 35 chickens and 20 cows. What is the ratio of the number of cows to the

Anton [14]

7/4 because you simplify

5 0

2 years ago

According to a study conducted by the Toronto-based social media analytics firm Sysomos, of all tweets get no reaction. That is,

Svetllana [295]

Answer:

a) E(X) = 71

b) V(X) = 20.59

Sigma = 4.538

Step-by-step explanation:

The question is incomplete:

According to a 2010 study conducted by the Toronto-based social media analytics firm Sysomos, 71% of all tweets get no reaction. That is, these are tweets that are not replied to or retweeted (Sysomos website, January 5, 2015).

Suppose we randomly select 100 tweets.

a) What is the expected number of these tweets with no reaction?

b) What are the variance and standard deviation for the number of these tweets with no reaction?

This can be modeled with the binomial distribution, with sample size n=100 and p=0.71, as the probability of no reaction for each individual tweet.

The expected number of these tweets with no reaction can be calcualted as the mean of the binomial random variable with these parameters:

$E(X)=n\cdot p=100\cdot 0.71=71$

The variance for the number of these tweets with no reaction can be calculated as the variance of the binomial distribution:

$V(X)=np(1-p)=100\cdot0.71\cdot0.29=20.59$

Then, the standard deviation becomes:

$\sigma=\sqrt{V(X}=\sqrt{20.59}=4.538$

5 0

3 years ago