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lesya692 [45]
3 years ago
8

My brother owes me $10. I already have $10. My dads friend gave me and him $20 to split in half. He gave me the $20 and took my

$10. Does he still owe me. Explain plz
Mathematics
1 answer:
SVETLANKA909090 [29]3 years ago
5 0
Yes...     You have $10
               your brother is supposed to give you $10
               he gives you the money the friend told him to and you would have $20 PLUS the ten that he owes you. That would make you have $30. He took youre ten and gave you 20 but you were supposed to have 20 in the first place. He needs to give you the ten back he owes you. 
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3x+6=-21
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x=-9

Final answer: -9, -7, -5
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How do i find the area?
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Answer:

28

Step-by-step explanation:

This is a trapezoid of width 4 and legs 8 and 6.

First we find the average length; it is (8 + 6)/2, or 7.

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Question 2 options: A fence must be built to enclose a rectangular area of 45,000 ft2. Fencing material costs $4 per foot for th
mariarad [96]

Answer:

The length that would produce the least expenses is  A= 300 ft

The width  that would produce the least expenses is  B= 150 ft

Step-by-step explanation:

From the question we are told that the

           Required area to enclose is A = 45,000 ft^2

            Fencing material cost is C =$4 per foot for north and south

            Fencing material cost for east and west C_{E/W} = $8

The diagram for this question is shown on the first uploaded image

      From the diagram is mathematically evaluated as

                             AB = 45000

                    =>        B = \frac{45000}{A}

The overall cost of building this fence is

                T = 2 A (4) + 2(B)(8)

Substituting for B in the equation above

                T = 8A +16 (\frac{45000}{A} )

differentiating both sides with respect to x

              T' (A) =  8 - \frac{16 *45000}{A^2}

At minimum possible cost  T'(A) = 0

              => 8 - \frac{16 *45000}{A^2}  = 0

                  8A^2 = 16*45000

                   A^2 = \frac{16*45000}{8}

                    A = \sqrt{\frac{ 16*45000}{8} }

                      = 300 ft

Then B is mathematically evaluate as

                 B = \frac{45000}{300}

                     = 150 ft

Then the maximum is mathematically evaluated as

                T = 8 (300) + 16(150)

                     =$4800          

 

3 0
3 years ago
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