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Amiraneli [1.4K]
3 years ago
10

I just need the answers to #11 and 12.

Mathematics
1 answer:
Alla [95]3 years ago
8 0
Your correct answers would be in the attachment below.

I really hope you found this useful.
~Jurgen

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Which value for x makes the equation x -4.21 = 6.047 true? A. x = 10.68 C. X = 10.247 B. x = 10.257 D. x = 1.837​
Anuta_ua [19.1K]

Answer:

C. X = 10.247

Step-by-step explanation:

X -4.21 = 6.047

just you will add 4.21 to both sides of the equation

X -4.21 + 4.21 = 6.047 + 4.21

X = 10.247

3 0
2 years ago
Read 2 more answers
How do you solve each system by graphing
abruzzese [7]

See the attached graph

<h2>Explanation:</h2>

Hello! Remember to write complete questions in order to get good and exact answers. Here you don't provide any system so I couldn't help you in an exact way, but in a general manner. When solving systems by graphing we just need to find the points of intersection of the graphs of the functions that built up the system.

Suppose you have the following system of linear equation:

\left\{ \begin{array}{c}y=2x+3\\3y=8x+27\end{array}\right.

yBy using graphing tools, we get the graph shown below. As you can see, the point of intersection of both lines is (-9,-15)

<h2>Learn more:</h2>

Solving systems by graphing: brainly.com/question/13799715

#LearnWithBrainly

8 0
3 years ago
If RTBA is a rhombus, solve for y and find the m&lt;RAB​
navik [9.2K]
Have a nice day!!!!
5 0
3 years ago
The temperature of a cup of coffee varies according to Newton's Law of Cooling: dT dt equals negative k times the quantity T min
dolphi86 [110]
This is a doozy.  I actually have another form of the equation for cooling, and it's in Celcius (so I convert) and seconds (we can switch back to minutes in the end).  The Celcius and Fahrenheit don't matter because it's the time we are interested in and as long as we use the C and F equivalents, we're fine.  Promise.  The formula is as follows: T(t)= T_{s}+( T_{0}- T_{s})e ^{-kt}.  It's really easy to use.  T(t) is the ending temperature; T_{s} is the room temp; T_{0} is our initial temperature of the liquid; e is Euler's number, k is the constant of variation, and t is the time in seconds.  In Celcius, our temps are as follows:  180 F = 82.2 C; 100 F = 37.8 C; 75 F = 23.9 C; 80 F = 26.7 C.  10 minutes is 600 seconds.  Filling in our formula with all of that, we will solve for k.  Then we will use that k value to solve for the time in the question we are told to answer.  Let's do this.  37.8=23.9+(82.2-23.9)e ^{-600k}.  Simplifying a bit we have 37.8=23.9+(58.3)e ^{-600k}.  Subtracting 23.9 from both sides we have 13.9=58.3e ^{-600k}.  divide both sides by 58.3 to get .2384219=e ^{-600k}.  At this point in your mathematical career, I'm assuming that since you're doing this, you're studying natural and common logs.  The base of a natural log is e, therefore, if we take the natural log of e, they both "undo" each other and cancel each other out completely.  So let's do that. ln(.2384219)=-600k.  Simplifying on the left gives us -1.433713=-600k.  Dividing both sides by -600 gives us a k value of .002389.  Now we will do the equation again, using that k value, to solve for how long it takes for the coffee to cool to 80 F (26.7 C).26.7=23.9+(82.2-23.9)e ^{-.002389t}.  Simplifying a bit again gives us 26.7=23.9+(58.32)e ^{-.002389t}.  Subtracting 23.9 from both sides gives us 2.8=(58.32)e ^{-.002389t}.  We will now divide both sides by 58.32 to get .0480109=e ^{-.002389t}.  Again we will take the natural log of both sides to "undo" the e: ln(.0480109)=-.002389t.  The natural log of .0480109 is -3.036325671.  So, dividing both sides by the negative decimal on the right gives us \frac{-3.036325671}{-.002389}=t and t = 1270.9 seconds.  Divide that by 60 to get the time in minutes.  t = 21.1826...so 21 minutes.  Phew!!!
7 0
3 years ago
Read 2 more answers

Olin [163]

Answer:

B

Step-by-step explanation:

definitely b because 6 percent of 2000 is 120 and 120 x 2 is 240 so add that to the 2000 and theres your answer

7 0
2 years ago
Read 2 more answers
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