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aev [14]
3 years ago
5

Evaluate the expression 7+4b when b= 3

Mathematics
2 answers:
Kamila [148]3 years ago
7 0

We can substitute 4b with 12, because 4 * 3 = 12. 4b is the same as 4 different b's, and when we know b is 3, we can multiply 4 by 3 to get 12.

7 + 4b =

7 + 4 * 3 =

7 + 12 =

19.

7 + 4b when b = 3 is 19.

Jlenok [28]3 years ago
4 0

Answer:

19

Step-by-step explanation:

Since we know the value of b we can add it into the equation

1. 7+4(3)

Now we can simplify, lets start with multiplication

2. 7+12

Finally, simplify

3. 7+12= 19

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5 0
3 years ago
One group of scientists (Group A) has measured a time for a particular chemical reaction to be completed to be 7.34 ± 0.05 s. A
Nesterboy [21]

Answer:

1. Group A and B agree with each other.

2. Group A and C do not agree with each other.

Step-by-step explanation:

When we are analizing this problem, we will see what are the ranges of this measured times. Since we are taking into account the error we can see that :

  • Group A varies from 7.34-0.05 to 7.34+0.05. So the limits are (7.29 ;7.39)
  • Group B varies from 7.38-0.03 to 7.38+0.03. So the limits are (7.35; 7.41)
  • Group C varies from 7.46-0.06 to 7.46+0.06. So the limits are (7.40; 7.52)

Question 1 is about the overlapping response in Group A and Group B. And yes, we have an overlap between 7.35 to 7.39. Among this times both group A and B are in agree with each other within the experimental uncertainty.

Question 2 is now referring to Group A and Group C. And no, there isn't any common time where both groups agree with each other.

7 0
3 years ago
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