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mixer [17]
3 years ago
7

a student solved the equation 3(2x-6)=4x+8 and found the solution to be x=2.6. How could you use estimation and mental math to s

how that the students solution is incorrect?
Mathematics
1 answer:
kifflom [539]3 years ago
3 0
2.6~= 3

0=20 , impossible

6x-18=4x+8
2x=26
x=13
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Factor:<br><br> 11x^2+35x+6<br><br> I dont know how to do this one either. Lol.
Allushta [10]
The answer is x= -3, or <span> x = -2/11 = -0.182</span>
4 0
4 years ago
Read 2 more answers
(Please someone help me!) (No links!)
mr_godi [17]

Answer: 1 4/5 / 2/7 = 63/

10

= 6 3/10  

= 6.3

Step-by-step explanation:

Conversion a mixed number 1 4/

5

to a improper fraction: 1 4/5 = 1 4/

5

= 1 · 5 + 4/

5

= 5 + 4/

5

= 9/

5

To find a new numerator:

a) Multiply the whole number 1 by the denominator 5. Whole number 1 equally 1 * 5/

5

= 5/

5

b) Add the answer from previous step 5 to the numerator 4. New numerator is 5 + 4 = 9

c) Write a previous answer (new numerator 9) over the denominator 5.

One and four fifths is nine fifths

Divide: 9/

5

: 2/

7

= 9/

5

· 7/

2

= 9 · 7/

5 · 2

= 63/

10

Dividing two fractions is the same as multiplying the first fraction by the reciprocal value of the second fraction. The first sub-step is to find the reciprocal (reverse the numerator and denominator, reciprocal of 2/

7

is 7/

2

) of the second fraction. Next, multiply the two numerators. Then, multiply the two denominators. In the following intermediate step, the fraction result cannot be further simplified by canceling.

In other words - nine fifths divided by two sevenths = sixty-three tenths.

4 0
3 years ago
Read 2 more answers
Ten people at two local rest
Arlecino [84]
What are you asking???
4 0
3 years ago
Read 2 more answers
What is the value of X?
svet-max [94.6K]

Answer: 71 degrees.

Step-by-step explanation:

Due to the triangle being isosceles (Two sides are equal), we can assume that the angles will also be equal.

You can take 180 (The total of a triangle) and subtract by the known degree

180 - 38 = 142

Now we divide 142 by two, ONLY because this is case; both angles will be the same degree.

142 / 2 = 71

Therefore; x = 71

6 0
3 years ago
For the graphed function f(x) = (2)^x + 2 + 1, calculate the average rate of change from x = -2 to x = 0
Monica [59]
X1=-2 and x2=0
We need to find y1 and y2 so
F(-2)=2^(-2+2)+1=2
The point(x1,y1)=(-2,2)
F(0)=2^(0+2)+1=5
The point(x2,y2)=(0,5)
Now, calculate the average rate of change (slope):
m = (y2 – y1) / (x2 – x1) =(5-2)/(0-(-2))
m=3/2
The answer is c
Hope it helps
5 0
4 years ago
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