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Aneli [31]
2 years ago
15

Can you put 2x-y=7 into y equals

Mathematics
2 answers:
Keith_Richards [23]2 years ago
3 0
Subtract 7 from both sides 2x-y-7=0

Then add y to both sides 2x-7=y
Andrej [43]2 years ago
3 0

Answer:

y = 2x - 7

Step-by-step explanation:

Step 1: Subtract 2x from both sides.

  • 2x - y - 2x = 7 - 2x
  • -y = -2x + 7

Step 2: Divide both sides by -1.

  • -y/-1 = (-2x + 7)/-1
  • y = 2x - 7
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Situation:A researcher in North America discoversa fossile that contains 65% of its originalamount of C-14..-ktN=NoeNo inital am
zheka24 [161]

SOLUTION

We have been given the equation of the decay as

\begin{gathered} N=N_0e^{-kt} \\ where\text{ } \\ N_0=initial\text{ amount of C-14 at time t} \\ N=amount\text{ of C-14 at time t = 65\% of N}_0=0.65N_0 \\ k=0.0001 \\ t=time\text{ in years = ?} \end{gathered}

So we are looking for the time

Plugging the values into the equation, we have

\begin{gathered} N=N_0e^{-kt} \\ 0.65N_0=N_0e^{-0.0001t} \\ e^{-0.0001t}=\frac{0.65N_0}{N_0} \\ e^{-0.0001t}=0.65 \end{gathered}

Taking Ln of both sides, we have

\begin{gathered} ln(e^{-0.000t})=ln(0.65) \\ -0.0001t=ln(0.65) \\ t=\frac{ln(0.65)}{-0.0001} \\ t=4307.82916 \end{gathered}

Hence the answer is 4308 to the nearest year

8 0
1 year ago
Set up equations and solve.
zavuch27 [327]
One weights 30lbs the other weights 54lbs
3 0
3 years ago
Find each percent change 40 to 2
Nostrana [21]

The question we need to ask is what percent of 2 is 40?

40 is 20 times 2 so 20 would be 2,000%

We need to subract 100% from any percent change:

2,000% - 100% = 1,900%

ANSWER: 1,900%

3 0
3 years ago
8x-18=30 math homework I need help
horsena [70]
Ok i will give you a hint ok look subtract 18-30 then you will get yhe answef for 8× ok try it
7 0
3 years ago
Read 2 more answers
There were 27,000 people at a ball game in Los Angeles. The day's receipts were $204,000. How many people paid $13 for reserved
Studentka2010 [4]
21000 people paid for general admission and 6000 paid for reserved seats. This is solved by making 2 equations. Out of 27000 people who were at game, x of them paid for general admission and y for reserved seats, thus
x + y = 27000
As said, daily receipts were 204000$. As reserved seat is 13$, y of them gave 13$ each (y*13$) and x of them gave 6 for general admission(x*6) and those two add up and we get second equation
13y + 6x = 204000.
This can be solved by transforming first equation into x = 27000 - y and then replacing the x in second.
13y + 6*(27000 - y) = 204000
13y + 162000 - 6y = 204000
7y = 42000
y = 6000
x + 6000 = 27000
x = 27000 - 6000 = 21000
5 0
3 years ago
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