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andrew-mc [135]
4 years ago
7

How do you work out this problem?3x+15=66

Mathematics
2 answers:
vivado [14]4 years ago
4 0

3x + 15 = 66

<u>      -15    -15</u>

3x =  51

Divide 51 by 3 which equals 17.

Alex4 years ago
4 0
Get 3x by itself then divide it by the number on th other side of the equation

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A set of data items in normally distributed with a mean of 400 &amp; a standard deviation of 40. Find the data item in this dist
kumpel [21]
-6.3=\dfrac{x-400}{40}\implies x=148
6 0
3 years ago
Plz help kinda confused
Mars2501 [29]

Answer:

44

Step-by-step explanation:

The sum of the angles of a triangle add to 180 degrees.

Call the third angle x

x +34 + 102 = 180

Combine like terms

x +136 = 180

Subtract 136 from each side

x +136-136 = 180 -136

x =44

6 0
3 years ago
Read 2 more answers
X/10=2/4?<br> or x over 10<br> equals to 2 over 4
lara31 [8.8K]
The answer is:  " x = 5 " .
_______________________________________________
Note the following:
_______________________________________________

2/4 = 1/2 ; 

1/2 = (1*5) / (2*5) = 5/10 ; 

2/4 = 1/2 = 5 / 10 . 

or:  2/4 = 1/2 = 0.5 = 5/ 10 .  

The answer:  " x = 5 " .
___________________

Or:  x/ 10 = 2/4 ;  

Cross-multiply:

  4x = (2)(10) ; 

  4x = 20 ; 

Divide each side by "4" ; 

  4x / 4 = 20/4 ; 

   " x = 5 " ; 
_____________________
Or:  x/10 = 2/4 ; 

Note:  "2/4 = 1/2" ;  so rewrite as:

x/10 = 1/2 ; and cross-multiply:

2x = (10)(1) ; 

2x = 10 ; 

Divide each side of the equation by "2" ; 

2x / 2 = 10 / 2 ; 

  " x = 5 " . 
______________________________________

8 0
4 years ago
Please help me out? Cannot be taken again. Ty!
olga55 [171]
42 ......I think ...........!
5 0
3 years ago
Read 2 more answers
X-y=2<br> y=1/2x<br><br> I know to substitute it in (first step) but I forget what comes after
laila [671]
X -(1/2x) = 2
1/2x = 2
x = 4
(4) - y = 2
y = 2
6 0
3 years ago
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