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Studentka2010 [4]
3 years ago
14

What two integers have the product of 28 and the sum of -11 ? a -2 and -14 b 4 and 7 c -4 and -7 d 2 and 14

Mathematics
1 answer:
dsp733 years ago
5 0

Hey there! I'm happy to help!

Let's look at the factors of 28.

1,28

2,14

4,7

We see that 4 and 7 add to make 11, but not -11. Well, we can just make both of them negative and then it will be -11 and their product will still be 28. Our numbers are -4 and -7.

Have a wonderful day! :D

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2 years ago
]. six pears and three apples cost $3.90. two pears and five apples cost $3.30. how much does one pear cost
Ilya [14]
Write the equation of the cost
p stands for the cost per pear, a stands for the cost per apple
6p + 3a = 3.9
2p + 5a = 3.3

Solve the equation system
To solve the equation system, we work on eliminating variable p so we will find the number of a. To eliminate, we have to change the coefficient of p to the same number (i will change it to coefficient 6)
6p + 3a = 3.9 (multiply 1)
2p + 5a = 3.3 (multiply 3)
---------------------------------
6p + 3a = 3.9
6p + 15a = 9.9
-------------------- - (substract)
      -12a = -6
           a = -6/-12
           a = 0.5

To find the cost per pear, subtitute the number of a to one of the equation
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2p + 5(0.5) = 3.3
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2p = 3.3 - 2.5
2p = 0.8
p = 0.4

The cost of one pear is $0.4
6 0
3 years ago
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