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GalinKa [24]
3 years ago
11

What is the sum of the first 11 terms of the arithmetic series in which a1= -12 and d=5?

Mathematics
1 answer:
SVEN [57.7K]3 years ago
3 0
Hello :  
the terme general is : an = a1 +(n-1)d
 a11 = a1+(11-1)×5
a11 = -12+50
a11 = 38
<span>the sum of the first 11 terms is : S11 = (11/2)(a1+a11)
</span>S11 = (11/2)(-12+38)
S11 = 143
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In the year 2017, an estimated 4,347,000 people in this country are illiterate.
Salsk061 [2.6K]

The number of people of the country which is predicted will be illiterate in the year 2025 are 1,300,700.

<h3>What is percentage decrease?</h3>

Percentage decrease is the amount deducted or reduced from the initial value in the percentage part.

In the year 2017, an estimated 4,347,000 people in this country are illiterate. With new incentives and funding, The country is hoping to cut that number by 14% every year.

Total year from 2017 to 2025 are 8 years. Thus, use the following formula of compound interest to find percentage decrease:

A=P\times\left(1+\dfrac{r}{100}\right)^{t}\\

Here, A is the final population, The initial population is P, the rate is r and the time period is t. Put the values,

A=4347000\times\left(1-\dfrac{14}{100}\right)^{8}\\A\approx1300700

Thus, the number of people of the country which is predicted will be illiterate in the year 2025 are 1,300,700.

Learn more about the percentage decrease here;

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2 years ago
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prohojiy [21]
70-35 I believe that’s write
8 0
2 years ago
100 POINTS PLUS BRAINLY
Iteru [2.4K]

Answer:

\sf adjacent  = 4.5 \ ft

Given:

  • opposite side: 13 ft
  • adjacent unknown
  • angle of 71°

using tan rule:

\sf tan(x) = \dfrac{opposite}{adjacent}

\hookrightarrow \sf tan(71) = \dfrac{13}{adjacent}

\hookrightarrow  \sf adjacent  = \dfrac{13}{tan(71) }

\hookrightarrow  \sf adjacent  = 4.5

4 0
2 years ago
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Serga [27]

Answer:

12

7

2

- 3

- 8

Step-by-step explanation:

f ( - 2 )

= 2 - 5 ( - 2 )

= 2 - ( - 10 )

= 2 + 10

= 12

f ( - 1 )

= 2 - 5 ( - 1 )

= 2 - ( - 5 )

= 2 + 5

= 7

f ( 0 )

= 2 - 5 ( 0 )

= 2

f ( 1 )

= 2 - 5 ( 1 )

= 2 - 5

= - 5 + 2

= - 3

f ( 2 )

= 2 - 5 ( 2 )

= 2 - 10

= - 10 + 2

= - 8

6 0
3 years ago
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VLD [36.1K]

Answer:

22

74

Step-by-step explanation:

7 0
3 years ago
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