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Alchen [17]
3 years ago
13

Find the sum of the first 21 terms of the arithmetic sequence 5, -2, -9.

Mathematics
2 answers:
Vadim26 [7]3 years ago
6 0

Answer:

-1365

Step-by-step explanation:

The difference is -7, so you apply that to each number to get your answer.

USPshnik [31]3 years ago
5 0
The correct answer is idk for me
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Write the prime factorization of 36. Use exponents when appropriate and order the factors from least to greatest (for example, 2
sladkih [1.3K]

Answer:

                                 36

                        2        x       18

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Step-by-step explanation:

6 0
3 years ago
What is the measure of angle k?
Murljashka [212]

9514 1404 393

Answer:

  59°

Step-by-step explanation:

Opposite angles of an inscribed quadrilateral are supplementary.

  ∠N +∠L = 180°

  (a +16) +(a -18) = 180

  2a = 182 . . . . . . . . . . add 2

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Then the measure of angle M is ...

  ∠M = (a+30)° = (91 +30)° = 121°

and angle K is its supplement.

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  ∠K = 59°

8 0
2 years ago
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