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Alja [10]
3 years ago
9

Help!!!

Mathematics
1 answer:
pashok25 [27]3 years ago
5 0

A. $7/1 lb

The first intersection is at (7,1)

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Which of the following expressions correctly uses the properties of summations to represent
madam [21]

Answer:

Option C is correct.

7 \cdot \sum_{i=1}^{18} i^2 + 9 \cdot 18

Step-by-step explanation:

Given the expression:  \sum_{i=1}^{18} (7i^2+9)

Using properties of summation:

  • \sum_{i=1}^{n} (a+bi) =\sum_{i=1}^{n} a + \sum_{i=1}^{n} bi
  • \sum_{i=1}^{n} a = an

Using properties of summation in the given expression we have;

\sum_{i=1}^{18} (7i^2+9)

= \sum_{i=1}^{18} 7i^2 + \sum_{i=1}^{18} 9

=7 \cdot \sum_{i=1}^{18} i^2 + 9 \cdot 18

Therefore, the following given expression uses the properties of summation to represents is, 7 \cdot \sum_{i=1}^{18} i^2 + 9 \cdot 18


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The instructions on the bag of concrete mix say to add 2 gallons of water to each 8 pound bag of concreate mix. how much concrea
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Here are the answers.

6. 63/100

7. 75/100 = 3/4

8. 91/100

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10. 3/100

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12. 5/100 = 1/20

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17. 99/100

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19. 15/100 = 3/20

20. 84/100 = 21/25

I hope you find this answer the most helpful! :)
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The bases of the trapezoid are 24 m and 9.6 m.

The area of the trapezoid is 141.12 m².
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