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dsp73
3 years ago
13

Find the sum of the first nine terms 100,−40,16

Mathematics
1 answer:
erica [24]3 years ago
8 0

9514 1404 393

Answer:

  71.447296

Step-by-step explanation:

The sequence is geometric with first term 100 and common ratio -0.4. Then the sum of n terms is ...

  Sn = 100(1 -(-0.4)^n)/(1 -(-0.4))

and the sum of 9 terms is ...

  S9 = 100(1 -(-0.4^9))/(1.4) = 71.447296

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Naddika [18.5K]

Step-by-step explanation:

Hope this helps, happy learning

3 0
3 years ago
Given: -2x < 10. Choose the solution set.
nadya68 [22]

Answer:

C

Step-by-step explanation:

given - 2x < 10 ( divide both sides by - 2 )

Remembering that the symbol is reversed when multiplying/ dividing by a negative quantity.

x > - 5 ← note reversal of symbol

solution is {x | x > - 5 } → C


4 0
3 years ago
Please solve with explanation
OverLord2011 [107]

Real life scenarios of acute angles are:

  • Sighting a ball from the top of a building at an angle of 55 degrees.
  • The angle between two adjacent vanes of a fan that has 6 vanes

<h3>What are acute angles?</h3>

As a general rule, an acute angle, x is represented as: x < 90

This means that acute angles are less than 90 degrees.

<h3>The real life scenarios</h3>

The real life scenarios that involve acute angles are scenarios that whose measure of angle is less than 90 degrees.

Sample of the real life scenarios that satisfy the above definition are:

  • Sighting a ball from the top of a building at an angle of 55 degrees.
  • The angle between two adjacent vanes of a fan that has 6 vanes

Read more about acute angles at:

brainly.com/question/3217512

#SPJ1

8 0
2 years ago
For z = –2 + 2i, which graph represents z and –2z?
iVinArrow [24]

Answer:

Graph B

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
I have a strange True or False question on my packet.. But here I go: "A trapezoid has two 90 degree angles." Is it true or fals
alex41 [277]

Answer:

False unless a right trapezoid.

Step-by-step explanation:

All trapezoids have 4 angles which add to 360 degrees. The angles can be any measure except in a right trapezoid which does have two 90 degree angles. It is not a requirement to be a trapezoid though so this is false.

8 0
3 years ago
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