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valkas [14]
3 years ago
9

X - y = 6x = y + 2Solve the system of equations by substitution.

Mathematics
1 answer:
worty [1.4K]3 years ago
6 0

Answer:

No Solution.

Step-by-step explanation:

x-y=6

x=y+2

y+2-y=6

2=6

no solution

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Will mark brainlist!! help please ​
lapo4ka [179]

Answer:

It is the 3rd one 9/5y+9.

6 0
3 years ago
Find the value of the formula using the numbers given <br> B=8x+9b when b=1.25 and x=2.25
Pavlova-9 [17]

Answer:

29.25

Step-by-step explanation:

(8 x 2.25) + (9 x 1.25)

18 + 11.25

29.25

i hope this helps

4 0
3 years ago
The density of a certain material is such that it weighs 70 pounds for every 8.5 gallons of volume. Express this density in kilo
STALIN [3.7K]

The correct answer is 0.99kg/L

Explanation:

To find the density, the first step is to convert the weight (mass) and the volume into the appropriate units.

The volume is 8.5 gallons and this needs to be converted to litters. In this case, multiply the volume in gallons by 3.785 because each gallon contains 3.785 liters.

8.5 x 3.785 = 32.1725 liters

The mass is 70 pounds and this needs to be converted to kilos. In this case, divide the pounds by 2.204 considering each kilo contains 2.204 pounds.

70 ÷ 2.2046 = 31.751 kilos

Now, find the density by dividing the mass into the volume.

Density= 31.751 kg ÷ 32.1725 L

Density = 0.98 kg/L

This means the density is 0.9.868 kg/L and this can be rounded as 0.99 kg/L

4 0
3 years ago
Which expression represents the determinant of A=[-6 -7 -4 -2<br> ]
hram777 [196]
Is that the whole problem?
6 0
3 years ago
Read 2 more answers
The half life of a certain tranquilizer in the bloodstream is 36 hours. How long will it take for the drug to decay to 87% of th
Fudgin [204]

<u>Finding the Decay constant(λ):</u>

λ = 0.693 / (half-life)

we are given that the half-life is 36 hours

λ = 0.693 / (36)

λ = 0.01925 /hour

<u>Time taken for 87% decay:</u>

Since decay is first-order, we will use the formula:

t = \frac{2.303}{decay constant}log(\frac{A_0}{A} )

Where A₀ is the initial amount and A is the final amount

Let the initial amount be 100 mg,

the final amount will be 87% of 100

Final amount = 100*87/100 = 87 mg

<em>Replacing the values in the equation: </em>

<em />t = \frac{2.303}{0.01925}log(\frac{100}{87} )<em />

<em />t = \frac{2.303}{0.01925}*0.06<em />

t = 7.18 hours

<em>We used 'hours' as the unit because the unit of the decay constant is '/hour'</em>

Therefore, the drug will decay to 87% of initial dosage after 7.18 hours

7 0
3 years ago
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