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velikii [3]
3 years ago
15

There are 70 students in the school band. 40% of them are sixth graders, 20% are seventh graders, and the rest are eighth grader

s. How many are eighth graders? Explain your reasoning. *
Mathematics
2 answers:
nirvana33 [79]3 years ago
8 0
The answer is 10% if There is 40% six graders and 20% seventh graders then you need 10% more to make 100% so it’s 10% eighth graders
choli [55]3 years ago
5 0

Answer:

The answer would be 40% because if there are 40% 6th graders and 20% 7th graders 40 plus 20 = 60 so 60 plus 40 = 100%

Step-by-step explanation:

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Need help, show work on a piece of paper<br>on problem 8
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<h3>Given</h3>
  • ∠AOB = ∠COD = x² -2
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Substituting the given values of the angles into the given relaion, we get ...

... (x² -2) + (2x -10) + (x² -2) = 16x +2

... 2x^2 -14x -16 = 0 . . . . . subtract the right side (16x+2)

... 2(x +1)(x -8) = 0 . . . . . . .factor

Values of x that satisfy this equation are ...

... x = -1, x = 8

The value x = -1 does not give rise to positive angle values.

For x = 8, the angles are ...

... ∠AOB = ∠COD = 8²-2 = 62

... ∠BOC = 2·8 -10 = 6

... ∠AOD = 16·8 +2 = 130 . . . . = 62 +6 +62

The answer to the question not asked is ...

... x = 8; ∠AOB = ∠COD = 62; ∠BOC = 6; ∠AOD = 130

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