(7x+3)-(2x+1) how would you subtract this

1 answer:

7 0

First re-write the problem and distribute the negative... 7x+3 -2x-1.
Then combine like terms as so... 7x -2x= 5x and 3 - 1= 2.
Re-write once more... 5x+2.

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the school auditorium seats 130 people. For a particular performance, the number of seats reserved for students is 25 are more t

Lady bird [3.3K]

Since we are trying to find the adult seats, we'll set that to x. Now the student section is 2x + 25. The total seats is 130 which is the student section and adult section added together. So now we can write an equation from the information given...

Students + adults = 130
(2x + 25) + x = 130
2x +25 +x = 130
2x + x + 25 = 130
3x + 25 = 130
3x = 130 - 25
3x = 105
x = 105/3 = 35

So there are 35 adult seats (remember we set adults to x)

Now we substitute back into the equation to find the students seats. As you recall students = 2x + 25

Students = 2x + 25
Students = 2(35) + 25
Students = 70 + 25
Students = 95

There are 95 student seats and 35 adult seats.

7 0

3 years ago

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Pepsi [2]

D 450 hope this helps you

3 0

3 years ago

Evaluate 6C3. 18 20 60 120

melomori [17]

Answer:

Step-by-step explanation:

$nC_{r}=\frac{n!}{r!(n-r)!}\\\\6C_{3}=\frac{6!}{3!(6-3)!}\\\\=\frac{6!}{3!(6-3)!}==\frac{6!}{3!3!}\\=\frac{6*5*4*3!}{3!3!}\\\\=\frac{6*5*4}{3!}\\\\=\frac{6*5*4}{3*2*1}\\\\ =5*4=20$