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andrew11 [14]
3 years ago
13

Five times the number of test tubes in a school’s chemistry lab exceeds three times the number of beakers it has by 660. The sum

of two times the number of test tubes and five times the number of beakers is 450. The number of beakers in the school’s lab is? and the number of test tubes in the school’s lab is?
Mathematics
1 answer:
Usimov [2.4K]3 years ago
4 0
<span>5t=3b+660....and ... 2t+5b=450

from the first we can see that t=(3b+660)/5 and using this value in the second...

(6b+1320)/5+5b=450 making all have common denominator..

6b+1320+25b=2250

31b=930

b=30...and since 2t+5b=450

t=150</span>
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3 0
3 years ago
The diagonals of a quadrilateral QRST intersect at P(-1,3). QRST has vertices at Q(3,6) and R(-4,5). What must be the coordinate
erica [24]

S = (-5,0)

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Step-by-step explanation:

Step 1 :

Given

Q = (3,6) and R = (-4,5). P = (-1,3)

Let S be (a,b) and T be (c,d)

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Step 2 :

P is the midpoint  of QS

So we have (3+a) ÷ 2 =  -1  and (6 + b) ÷ 2 = 3

=> 3 + a = -2    and 6 + b = 6

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Step 3 :

P is the midpoint  of RT

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So T should be (2,1)

Step 4 :

Answer :

S = (-5,0)

T = (2,1)

6 0
3 years ago
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