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Len [333]
3 years ago
15

What is 81 rounded to the nearest ten?

Mathematics
2 answers:
babunello [35]3 years ago
8 0

Answer:

80

Step-by-step explanation:

tekilochka [14]3 years ago
4 0

Answer:

80

Step-by-step explanation:

Think of it like a hill

Anything 5 and under goes to 0

Anything above 5 influences the next number

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SOLVE. integration of (1-v) /(1+v^2)
Marta_Voda [28]
I think you have to first separate the integral:1/(1+v^2) + v/(1+v^2),
so the integral of the first term is ArcTan (v) and for the integral of the second term i recommend you to do a change of variable:

y= 1+v^2
 so
 dy= 2v
 and
v= dy/2and then you substitute:v/(1+v^2) = (1/2)(dy/y)
and the integral is
 (1/2) (In y)finally you plug in the initial variables:

(1/2)(In [1+v^2])

so the total integral is:

ArcTan (y) + (1/2)(In [1+v^2])
6 0
3 years ago
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EASY 7TH GRADE MATH 6 out of 8 dentists recommend crest toothpaste. In a group of 156 dentists, how many of them recommend crest
Novay_Z [31]

Answer:

117

Step-by-step explanation:

6/8 = ?/156

156/8 = 19.5

19.5 x 6 = 117

6/8 = 117/156

3 0
2 years ago
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A school requires an entrance exam score that is in the top 3% of the population in order to be accepted.
____ [38]
A. 485 is %3 of 500, but the deviation sets it slightly lower than that
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Which axis goes up and down (vertical)?
Iteru [2.4K]
The answer is 4. Y-axis
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(Set up and solve the system, then answer the associated question)
Dimas [21]

9514 1404 393

Answer:

  • red division: 6 teams
  • blue division: 5 teams

Step-by-step explanation:

We can let r and b represent the numbers of teams in the red and blue divisions, respectively. The total number of goals scored in each division will be the average for that division times the number of teams in that division.

  r - b = 1 . . . . . . there is 1 more red team than blue

  4.5r +4.2b = 48 . . . . . . total goals scored per week

__

Solving by substitution, we have ...

  r = b +1

  4.5(b +1) +4.2b = 48 . . . . substitute for r

  8.7b +4.5 = 48 . . . . . . . . simplify

  8.7b = 43.5 . . . . . . . . . . subtract 4.5

  b = 43.5/8.7 = 5 . . . . . divide by 8.7

  r = b +1 = 6 . . . . . . . . . find r

There are 6 red teams and 5 blue teams.

_____

<em>Additional comment</em>

The basic idea is that you make an equation for each relation given in the problem statement. For a problem like this, you do need to have an understanding of how the average number of goals would be calculated and how that relates to the total goals.

8 0
2 years ago
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