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Anna007 [38]
2 years ago
6

5x – 3= 17 X=? Find what x equals to.

Mathematics
2 answers:
ryzh [129]2 years ago
6 0

Answer:

x = 4

Step-by-step explanation:

5x – 3= 17 add 3 to both sides

5x = 20 divide both sides by 5

x = 4

Wewaii [24]2 years ago
5 0

Answer:

x=4

Step-by-step explanation:

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3 years ago
The sum of three consecutive even numbers is 174. What is the smallest of the 3 numbers?
Anarel [89]

The smallest value is 56.

First even number + second even number + third even number = 174

First even number: x

Second even number: x + 2

Third even number: x + 4

So, (x) + (x+2) + (x+4) = 174

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The sum of the 3rd and 7th terms of an A.P. is 38, and the 9th term is 37. Find the A.P?​
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Let <em>a</em> be the first term in the arithmetic progression. Then each successive term differs from <em>a</em> by a fixed number <em>c</em>, so that

• first term = <em>a</em>

• second term = <em>a</em> + <em>c</em>

• third term = (<em>a</em> + <em>c</em>) + <em>c</em> = <em>a</em> + 2<em>c</em>

• fourth term = (<em>a</em> + 2<em>c</em>) + <em>c</em> = <em>a</em> + 3<em>c</em>

and so on. In general, the <em>n</em>-th term in the AP is <em>a</em> + (<em>n</em> - 1) <em>c</em>.

The sum of the 3rd and 7th terms is 38, so that

(<em>a</em> + 2<em>c</em>) + (<em>a</em> + 6<em>c</em>) = 38

==>   2<em>a</em> + 8<em>c</em> = 38

==>   <em>a</em> + 4<em>c</em> = 19 … … … [1]

The 9th term is 37, so

<em>a</em> + 8<em>c</em> = 37 … … … [2]

Subtracting [1] from [2] eliminates <em>a</em> and lets you solve for <em>c</em> :

(<em>a</em> + 8<em>c</em>) - (<em>a</em> + 4<em>c</em>) = 37 - 19

4<em>c</em> = 18

<em>c</em> = 18/4 = 9/2

Solve for <em>a</em> using either equations [1] or [2] :

<em>a</em> + 8 (9/2) = 37

<em>a</em> + 36 = 37

<em>a</em> = 1

Then the <em>n</em>-th term in the AP is 1 + 9/2 (<em>n</em> - 1) or 9/2 n - 7/2, where <em>n</em> ≥ 1.

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