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andrew11 [14]
2 years ago
15

Помогите решить контрошу братья

Mathematics
1 answer:
LUCKY_DIMON [66]2 years ago
7 0

Answer:

.?

I don’t understand:/

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2. Find the 20th term of an arithmetic sequence if its 6th term is 14 and 14th term is 6.
Fudgin [204]

Answer:

\sf t_{20}= 0

Step-by-step explanation:

<h3>Arithmetic sequence:</h3>

      \sf \boxed{\bf n^{th} \ term = a + (n-1)d}\\\\\text{Here, a is the first term ; d is the common difference }

6th term is 14 ⇒ \sf t_6 = 14

                a + (6 - 1)d = 14

                    a  +  5d = 14  --------------(I)

14th term is 6 ⇒\sf t_{14} = 6

             a + (14-1)d = 6

                  a + 13d = 6 ----------------(II)

Subtract equation (II) from equation(I)

        (I)          a + 5d = 14

        (II)         a + 13d = 6

                    <u>-    -          -</u>

                            -8d = 8

                               d  = 8 ÷(-8)      

                              \sf \boxed{\bf d= (-1)}

Plugin d = -1 in equation (I)

a + 5(-1) = 14

      a -5  = 14

             a = 14 + 5

             \sf \boxed{\bf a = 19}  

20th term:

 \sf t_{20}= 19 + 19*(-1)

       = 19 - 19

   \sf \boxed{\bf t_{20} = 0}

8 0
1 year ago
Read 2 more answers
There are about 795 house in this region . the average family size is 6 people . there
jekas [21]

Answer:

4770 people

Step-by-step explanation:

795*6= 4770

7 0
3 years ago
BIG POINTS Please solve. Thanks!
Nitella [24]

9^1/3 * 3^x = 27^4/5

Rewrite 9 as 3^2

(3^2)^1/3 * 3^x = 27^4/5

Multiply the exponents in the first term:

3^2/3 * 3^x = 27^4/5

Use power rule to combine exponents:

3^(2/3 +x) = 27^4/5

Rewrite the 2nd term:

3^(2/3 +x) = (3^3)^4/5

Set the exponents only to equal:

2/3 + x = 3(4/5)

Solve for x:

simplify the right side:

2/3 + x = 12/5

Subtract 2/3 from both sides:

x = 26/15

3 0
3 years ago
In the equation <img src="https://tex.z-dn.net/?f=y%20%3D%20ax%5E%7B2%7D%20%2Bk" id="TexFormula1" title="y = ax^{2} +k" alt="y =
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virus link above me

dont download it pls u might get virus

3 0
2 years ago
Find the area of the figure. Use 3.14 for A.
BARSIC [14]

Answer: I think the answer might be 140 square meters

I really hope this helps!

Step-by-step explanation:

5 0
2 years ago
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