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Bond [772]
3 years ago
11

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.
What percentage of the band members are eighth graders?
Mathematics
2 answers:
8090 [49]3 years ago
8 0

Answer:

40%

Step-by-step explanation:

40% of 70 is 28

20% of 70 is 14

so there are 28 8th graders 28 is 40% of 70

Also, #SPEEDRUN

Alenkinab [10]3 years ago
7 0

Answer:40%

Step-by-step explanation:

lets just forget the number 70 because it wont change anything in this story problem

there must be the value 100% which equals the 70 students

the problem told that 40% of them are sixth graders while 20% are seventh and the rest are eighth so

100-(40+20)=40

if you didnt get it here another way:

40%+20%=60% which is the percentage of seventh and sixth graders together

the rest of the 100% is the eighth so you should subtract the 60% from the 100% which is "40%"

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(2x-7)-(4x^2+6x-3)+(x^2+4)
masha68 [24]

Answer:

-3x^2-4x

Step-by-step explanation:

Simplify:

\left(2x-7\right)-\left(4x^2+6x-3\right)+\left(x^2+4\right)

=2x-7-\left(4x^2+6x-3\right)+x^2+4

Group same factor:

=-\left(4x^2+6x-3\right)+x^2+2x-7+4

Add :

=-\left(4x^2+6x-3\right)+x^2+2x-3

Apply the distributive law: -(a+b) = -a - b

-\left(4x^2+6x-3\right)=-4x^2-6x+3

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Group same factor:

=-4x^2+x^2-6x+2x+3-3

Subtract:

=-4x^2+x^2-6x+2x

Add:

=-3x^2-6x+2x

Group same factor:

=-3x^2-4x

Hence answer = -3x^2-4x

<u><em>~lenvy~</em></u>

8 0
2 years ago
Twice the difference of a number and 16 is the same as three times a number less than 18
Maksim231197 [3]

Answer:

Step-by-step explanation:

Let x be the "number."

"twice the difference of a number and 16" can be written as:  

2(x-16)

"is the same as three times a number less than 18" can be written as:

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I wonder if this was meant to say "is the same as three times a number less  18," instead of "less than 18."  If so, we would have:

=3(x-18)

1.  Using the sentence as written:  2(x-16) = 3(x<18)

2.  Using the sentence as amended:  2(x-16) = =3(x-18)

 Going with this interpretation:  

 2(x-16) = 3(x-18)

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aev [14]

Answer:

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Step-by-step explanation:

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