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Tom [10]
3 years ago
10

You are told that an is an arithmetic sequence with a3=11 and a6=17. What is a15?

Mathematics
1 answer:
bekas [8.4K]3 years ago
4 0

Answer:

a15 = 35

Step-by-step explanation:

Given:

a3 = 11

a6 = 17

Find:

a15 = ?

Computation:

a3 = 11 ⇒ a+ 2d = 11..........Eq1

a6 = 17 ⇒ a + 5d = 17...............Eq2

From Eq2 - Eq1

⇒ 3d = 6

⇒ d = 2

And a = 7

So,

⇒ a15 = a + 14d

⇒ a15 = 7 + 14 (2)

⇒ a15 = 7 + 28

⇒ a15 = 35

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How can we solve this?
Delvig [45]
Both angles will equal 180, as there is a line bisecting line AB to create the two angles.

Set up the following equation to have both angles equal 180:

(x + 35) + (x - 23) = 180

x + 35 + x - 23 = 180

Combine like terms:

x + x = 2x
35 - 23 = 12

2x + 12 = 180

Subtract 12 from both sides:

2x = 168

Divide both sides by 2:

x = 84

We now know the value of x, so plug it into the equation we set up:

(84 + 35) + (84 - 23) = 180

119 + 61 = 180

An obtuse angle will have a measure above 90 degrees. The number on the left side that is above 90 degrees is 119. This would be the measure for the obtuse angle.

The obtuse angle is 119 degrees wide.
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The average temperature in a northern Canadian city is 1 degree Fahrenheit. The actual temperature in January differs by 10 degr
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Step-by-step explanation:

4 0
4 years ago
The dot plots show the heights of boys and girls at a summer camp.
joja [24]

Answer:

First choice:

  • <em><u>Most of the data in each plot are greater than 48.</u></em>

Explanation:

1. Boy's Heights.

Using the information you can create a frequency table:

Heigth    Frequency

40                   0

41                     1

44                    3

46                    3

48                    2

50                    3

52                    4

54                    4

56                    0

58                    0

60                    0

                   ======

                      20 boys

2. Girl's Heights.

Similarly, create your frequency table:

Height        Frequency

40                      0

41                       0

42                      0

44                      2

46                      3

48                       1

50                      3

52                       4

54                       3

56                       4

58                       0

60                       0

                      ======

                        20 girls

<em>Which is a true statement for most of the data in each plot?</em>

<u><em>Most of the data in each plot are greater than 48.</em></u>

  • Count the dots or add the frequencies from the tables.

  • For boys, the frequency of points greater than 48 is: 3 + 4 + 4 = 11 which is more than half (there are 20 dots).

  • For girls, the frequency of points greater than 48 is: 3 + 4 + 3 + 4 = 14, which is also more than half.

Hence, it is correct that most fo the data in each plot are greater than 48.

5 0
4 years ago
Read 2 more answers
Write -15.175 as a mixed number
Ksju [112]
-15 7/40

Convert a mixed number by placing the numbers to the right of the decimal over
1000.
7 0
3 years ago
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