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choli [55]
3 years ago
15

A group of students is investigating how the addition of salt impacts the floatation of an egg in water. Four identical cups wer

e taken for the experiment. The data of the experiment are shown.
Experimental Record
Cup
Amount of Water (mL)
Amount of Salt (g)
Level of Egg above Water
1
450
0
Sinks to bottom
2
450
68
2 cm
3
450
136
3 cm
4
450
272
4 cm

Which cup acts as a control group?

1
2
3
4
Mathematics
2 answers:
marishachu [46]3 years ago
8 0

Answer:

Cup 1 acts as a control group.

Step-by-step explanation:

Control group: The group used in the experiment by the researchers in which no change in the variable is done. It is then set as a benchmark for the groups which are being tested.

We are given 4 groups which are being experimented for the flotation of an egg in water.

Since in Cup 1, there is no addition of salt

So, there is no change in the variables.

So, by definition of control group .

So, cup 1 acts as a control group since there is no change in the variable .

Hence, the correct answer is Option 1.

Cup 1 acts as a control group.

oksano4ka [1.4K]3 years ago
3 0
Cup one is the cup do to there being  no salt


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Step-by-step explanation:

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¿En cuál de los siguientes intervalos están solo los números reales que pertenecen a ] –3 , 5 ] y no pertenecen a [ –1 , 7 [?
vitfil [10]

Complete question:

¿En cuál de los siguientes intervalos están solo los números reales que pertenecen a  ]- 3,5 ]   y no pertenecen a  [ –1 , 7 [  ?

A)  ]-3, -1[  

B)   ]- 3, -1 ]

C)  [-1,5]

D)  ]- 3,7[

E)  [5,7[

Answer:

A)  ]-3, -1[

Step-by-step explanation:

El intervalo ]- 3,5 ] incluye a todos los números que se encuentran entre -3 y 5. Es decir,

...-6  -5  -4  -3  -2  -1  0  1  2  3  4  5  6...

El intervalo  [–1 , 7[ excluye a los números que se encuentran entre -1 y 7, pero incluye a todos los números que sean menores a -1 y a todos los mayores a 7. Es decir,

...-7  -6  -5  -4  -3  -2  -1  0  1  2  3  4  5  6  7  8  9  10  11  12  13...

Para responder el problema, debemos encontrar aquellos números reales que se<u> </u><u>incluyan</u> dentro de <u>ambos intervalos</u>. Esto es,

            ]- 3,5 ] ...-6  -5  -4 <u> </u><u>-3  -2  -1</u>  0  1  2  3  4  5  6  7  8  9  10...

]- ∞ , -1[ ∪ [7,∞[...-6  -5  -4  <u>-3  -2  -1</u>  0  1  2  3  4  5  6  7 8  9  10...

Es decir que el intervalo  ]-3, -1[, corresponde a la intersección entre ambos conjuntos.

8 0
3 years ago
Whats (2 − 4u)(–3) i need help i found this question on ixl pls help
Marta_Voda [28]

Answer:

12u-6

Step-by-step explanation:

Distributive Property

(2 − 4u)(–3)

-3*2 + -4u*-3

-6+12u

12u-6

Hope this helped!

3 0
3 years ago
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