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kodGreya [7K]
3 years ago
13

5x - 2y = 21

Mathematics
1 answer:
kifflom [539]3 years ago
6 0

Answer:x=4 y=-1/2

Step-by-step explanation:

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Evaluate -x+4 when x = -2
Gnesinka [82]

Answer:

6

Step-by-step explanation:

=> -x+4

<u><em>Given that x = -2</em></u>

=> -(-2)+4

=> 2+4

=> 6

6 0
3 years ago
Read 2 more answers
Total cost for a computer if pay 600 down and 35.00 a month for 12 months
Stella [2.4K]
First step you would have to do would be to times 35 by 12 to see how much you would have to pay for 12 months.

35 x 12 = 420

Then, as you said, you a down payment of 600 so then you'd add.

600 + 420 = 1,020.

So the total cost of the computer would be $1,020.



8 0
3 years ago
2+2= what +6 HA they cant repo this so u guys can get points
Rzqust [24]

Answer:

10

Step-by-step explanation:

2+2=4

4+6= 10

5 0
3 years ago
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Find b. Round to the nearest tenth.
Svetradugi [14.3K]
Find Angle B:  B = 180 - (82+55) = 43.  Then apply the law of sines:

   b            8 cm
--------- = ----------
sin 43       sin 55
                                        (sin 43)(8 cm)
Solving for b, we get b = ------------------- = 6.66, or 6.7 (cm, to the nearest tenth).     
                                              sin 55
5 0
3 years ago
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A tank contains 1000 L of pure water. Brine that contains 0.05 kg of salt per liter of water enters the tank at a rate of 5 L/mi
Margaret [11]

Answer:

a) y(t)=0.65\frac{Kg}{min}(tmin)

b) y(40)=26Kg

Step-by-step explanation:

Data

Brine a (Ba)

V_{Ba}=5\frac{Lt}{min}\\  Concentration(Bca)=0.05\frac{Kg}{Lt}

Brine b (Bb)

V_{Bb}=10\frac{Lt}{min}\\  Concentration(Bcb)=0.04\frac{Kg}{Lt}

we have that per every minute the amount of solution that enters the tank is the same as the one that leaves the tank (15 Lt / min)

, then the amount of salt (y) left in the tank after (t) minutes: y=V_{Ba}*B_{ca}+V_{Bb}*B_{cb}=5\frac{Lt}{min}*0.05\frac{Kg}{Lt}+10\frac{Lt}{min}*0.04\frac{Kg}{Lt}=\\0.25\frac{Kg}{min}+0.4\frac{Kg}{min}=0.65\frac{Kg}{min}

Finally:

a) y(t)=0.65\frac{Kg}{min}(tmin)

b) y(40)=0.65\frac{Kg}{min}(40min)=26Kg

being y(t) the amount of salt (y) per unit of time (t)

5 0
2 years ago
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