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AlekseyPX
3 years ago
12

3r+6-r+2=3r-r+6+2=3+6+2=11

Mathematics
1 answer:
RSB [31]3 years ago
3 0
Move everything to the same side to make the equation equal zero
3r+6-r+2-3r+r-6-2-3-6-2-11=0
Collect like terms.
3r-r-3r+r+6+2-6-2-3-6-2-11=0
Solve
3r-r-3r+r=0
R=0, so just add the other numbers for the solution
6+2-6-2-3-6-2-11=-22
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A rectangle is constructed with its base on the​ x-axis and two of its vertices on the parabola yequals25minusxsquared. What are
Karolina [17]

Answer:

The answer is "\bold{\frac{32}{3}}\\"

Step-by-step explanation:

The rectangle should also be symmetrical to it because of the symmetry to the y-axis  The pole of the y-axis.  Its lower two vertices are (-x,0). it means that  

and (-x,0), and (x,0). Therefore the base measurement of the rectangle is 2x. The top vertices on the parabola are as follows:  

The calculation of the height of the rectangle also is clearly 16-x^2, (-x,16,-x^2) and (x,16,-x^2).  

The area of the rectangle:

A(x)=(2x)(16-x^2)\\\\A(x)=32x-2x^3

The local extremes of this function are where the first derivative is 0:

A'(x)=32-6x^2\\\\32-6x^2=0\\\\x= \pm\sqrt{\frac{32}{6}}\\\\x= \pm\frac{4\sqrt{3}}{3}\\\\

Simply ignore the negative root because we need a positive length calculation

It wants a maximum, this we want to see if the second derivative's profit at the end is negative.

A''\frac{4\sqrt{3}}{3} = -12\frac{4\sqrt{3}}{3}

8 0
3 years ago
Whats the reciprocal of 5​
zhannawk [14.2K]

Answer:

sorry im late but the answer is -5

Step-by-step explanation:

hoped i was able to help...:)

4 0
3 years ago
1.5+ (8) |<br> How to add that
marishachu [46]

Answer:

9.5 its easy you shouldn't need an explantion if you need comment below for one.

5 0
3 years ago
Read 2 more answers
135pounds 5 months later 120 pounds find percent decrease
Nataly [62]
135 ----- 100%
120 ----- x
------------------------
x = 120*100/135 = 88,8

100-88,8 = 11,2 % 

the decrease percent was 11,2 %

hope helped 
5 0
3 years ago
Rita makes and sells necklaces. The materials to make each necklace cost $2.75. Last week she made 8 necklaces and wants to make
Tresset [83]

Answer:

The error she made was that she was adding x and 2.75. She should subtract 2.75 from x.

Another mistake that she made was that she sold each for $7 assuming that she would make a profit of 78, but she should see each necklace for $12.5 so that she could make a profit of $78.

Step-by-step explanation:

The error she made was that she was adding x and 2.75.

She should write the equation as 8 (x - 2.75) = 78; as she spends $2.75 to make a necklace.

By using the correct equation: 8 (x - 2.75) = 78

=> 8x - 22 = 78

=> 8x = 78 + 22

=> 8x = 100

=> x = 100/8

=> x = 12.5

Another mistake that she made was that she sold each for $7 assuming that she would make a profit of 78, but she should see each necklace for $12.5 so that she could make a profit of $78.

Hope this helps you.

3 0
3 years ago
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