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Kruka [31]
2 years ago
9

Please give me the right answer. Expert help only.

Mathematics
1 answer:
son4ous [18]2 years ago
7 0

Answer:

25 x 40 = 1000

1210 - 1000 = 210

210 / 45 = 4.66 hours

Step-by-step explanation:

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Solving an exponential equation
sammy [17]

Answer:

To solve an exponential equation, take the log of both sides, and solve for the variable.

Step-by-step explanation:

Example 1: Solve for x in the equation  tex2html_wrap_inline119 .

Solution:

Step 1: Take the natural log of both sides:

displaymath121

Step 2: Simplify the left side of the above equation using Logarithmic Rule 3:

displaymath123

Step 3: Simplify the left side of the above equation: Since Ln(e)=1, the equation reads

displaymath127

Ln(80) is the exact answer and x=4.38202663467 is an approximate answer because we have rounded the value of Ln(80)..

Check: Check your answer in the original equation.

displaymath131

8 0
3 years ago
4x + 12 = -7y<br> -y + 12 = 4x<br> Solve with elimination
statuscvo [17]
Take the second equation and flip it around so the y on the left ends up on the right and the 4x on the right ends up on the left.  This makes all negatives positive and all positives negative.   -4x   + 12  = y 

Then add the first equation to the second equation 
4x   +12   = -7y
<u>-4x   + 12  </u>=<u> y </u>   this eliminates the x's
          <u>24</u> = -<u> 6y</u>            then divide by - 6
           - 6     - 6
         - 4    = y<u>

</u>So if you know that y = negative 4, you can substitute into either equation.  I pick the second one because I am a lazy person.  
  -y  + 12  = 4 x
-(-4) + 12 = 4 x     combine your numbers<u>
</u>   <u>  16     </u> = <u>4 x  </u>      then divide by 4<u>
</u>       4      =  x
So your solution is: x = 4 and y = -4 or this is also written (4, -4)

Does that work for you?
4 0
3 years ago
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In diagram below De is parallel to XY what is the value of X
barxatty [35]
The answer is 65° because 115° and another number has to add up to 180°
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3 years ago
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Help me pls this is hard
Luba_88 [7]

Answer:

I guess it is the Answer C

6 0
2 years ago
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Add the following<br><br> - 62 + (- 65)=
Ainat [17]

Answer:

-127

Step-by-step explanation:

7 0
3 years ago
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