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guapka [62]
4 years ago
14

PLEASE HELP!!

Mathematics
1 answer:
amm18124 years ago
7 0

Answer:

r=6

Step-by-step explanation:

m=\frac{y2-y1}{x2-x1}

m= -3

(2,8) (r,-4)

-3=\frac{-4-8}{r-2}

-3r+6=-12

-3r=-18

r= 6

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at the science school, there is one microscope for every 5 students. The principal figures that in order to have one for every 4
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Answer: 120 students

Explanation:

Let x be the number of scopes
Let a be the number of student at school

1x = 5 students
But 5x = a

1x = 4 students
But the principal needs 6 additional scope so that all the students can use it.

=> (x + 6) = 4 students
=> 4(x + 6) = a

Thus,
5x = 4(x + 6)
5x = 4x + 24
5x - 4x = 24
x = 24

So, there are 24 scopes.

Plug x in both equation and compare:

5x = a
5(24) = a
120 = a

4(x + 6) = a
4(24 + 6) = a
4(30) = a
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Therefore, the students at the school are 120
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