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Gennadij [26K]
3 years ago
6

Matilda asked 20 random people in the street if they would like to discuss what they want to do during the summer break. Seven o

f them said yes.
How is this sample biased?

(1)She should have asked more people.
(2)The people who chose to participate might not be similar to the people who didn’t.
(3)The number of people who agreed was too small.
(4)She should have asked girls only.
Mathematics
2 answers:
ArbitrLikvidat [17]3 years ago
5 0
I think option two is the correct one, because 1 and two contradict eachother and 4 doesn't make sense
netineya [11]3 years ago
5 0

Answer:I know the answer is not number one I choose it and it was wrong


Step-by-step explanation:


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What is the smallest positive number that can be added to 55 so that the resulting number and 45 have 9 as their greatest common
kolbaska11 [484]

Answer:

The smallest positive number is 8

Step-by-step explanation:

let the smallest positive number = x

45 is a multiple of 9 ⇒ 9 x 5 = 45

the next multiple of 9 after 55 is  63

= 9 x 7

= 63

Thus, x + 55 = 63

x = 63 - 55

x = 8

The greatest common factor of 45 and 63 = 9

Therefore, the smallest positive number is 8

5 0
3 years ago
The function a(t)=t^(1/2)−t^(−1/2) m/s^2 represents the acceleration of a particle moving along a horizontal axis. At time t=0,
garri49 [273]

Answer:

see below

Step-by-step explanation:

a(t)=t^(1/2)−t^(−1/2)

We integrate to find the velocity

v(t) = integral t^(1/2)−t^(−1/2) dt

     = t ^ (1/2 +1)         t ^ (-1/2 +1)

          ------------   -    -----------------  + c  where c is the constant of integration

              3/2                   1/2

v(t) = 2/3 t^ 3/2  - 2 t^ 1/2 +c

We find c by letting t=0 since we know the velocity is 4/3 when t=0

v(0) = 2/3 0^ 3/2  - 2 0^ 1/2 +c = 4/3

       0+c =4/3

       c = 4/3

v(t) = 2/3 t^ 3/2  - 2 t^ 1/2 +4/3

To find the position function we need to integrate the velocity

p(t) = integral 2/3 t^ 3/2  - 2 t^ 1/2 +4/3 dt

     2/3 t ^ (3/2 +1)        2 t ^ (1/2 +1)           4/3t

          ------------   -    -----------------  + ------------- + c  

              5/2                   3/2                    1

p(t) =  4/15 t^ 5/2 - 4/3t ^ 3/2 + 4/3t +c

We find c by letting t=0 since we know the position is -4/15 when t=0

p(0) =  4/15 0^ 5/2 - 4/3 0 ^ 3/2 + 4/3*0 +c = -4/15

         0 +c = -4/15

            c = -4/15

p(t) =  4/15 t^ 5/2 - 4/3t ^ 3/2 + 4/3t -4/15

8 0
3 years ago
Read 2 more answers
A Baker used 7 bags of cookie-doe to make 10 cookies he used__ of a doe for each cookies- How many?
Ksivusya [100]

Answer:

I think it is 70

Step-by-step explanation:

7(10)=70

70=70

3 0
2 years ago
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Maya can run 18 miles in 3 hours, and she can run can bike 18 miles in 2 hours. What is maya’s running speed (in mph)
viva [34]

Answer:

6 mph

Step-by-step explanation:

Speed = Distance/Time. Distance is 18, time is 3. So 18/3, or 6.

Hope this helps!

6 0
3 years ago
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Write an algebraic expression from the following
gavmur [86]

A: (x^2) + 2x

B: (3x)/(4+x)

C: (5-x) × 3x

4 0
3 years ago
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