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gavmur [86]
3 years ago
13

13x + 8 - 3 equals 12x-4​

Mathematics
2 answers:
motikmotik3 years ago
8 0
13x+8-3=12x-4
13x+5=12x-4
So x= -9

Check: 13(-9)+5=12(-9)-4
-117+5=-108-4
-112=-112. It works!

So x = -9
givi [52]3 years ago
5 0

Answer:

x=9

Step-by-step explanation:

13x+8-3=12x-4

+4

13x+8+1=12x

13x+9=12x

-13x

9=1x

x=9

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A hollow cylindrical iron pipe with external and internal radii 8cm and 6cm respectively and length 35cm is melted and recast in
marusya05 [52]

Answer: length of wire = 500cm

Step-by-step explanation:

We would determine the volume of material used in making the hollow cylindrical iron pipe by subtracting the volume of the inner pipe from the volume of the outer pipe.

The formula for determining the volume of a cylinder is expressed as

Volume = πr²h

Volume of inner pipe = π × 6² × 35 = 1260π

Volume of outer pipe = π × 8² × 35 = 2240π

Volume of material used in making the hollow cylindrical iron pipe is

2240π - 1260π = 980πcm³

The solid wire made is cylindrical and has a thickness of 2.8cm. This is the diameter. It means that the radius of the wire is 2.8/2 = 1.4cm

Volume of wire = 980πcm³

Applying the volume of cylinder formula, it becomes

980π = π × 1.4² × h

where h = length of wire

h = 980/1.4² = 500cm

3 0
3 years ago
Canceling units is also called: a. changing the value c. multiplication b. unit analysis d. making connections
SOVA2 [1]

Canceling units is also called unit analysis.

This is also called dimensional analysis.

What is a unit of analysis in statistics?

  • The unit of analysis is the entity that you're analyzing. It's called this because it's your analysis (what you want to examine) that determines what this unit is, rather than the data itself.
  • Because it is the analysis you do in your study that determines what the unit is.
  • For instance, if you are comparing the children in two classrooms on achievement test scores, the unit is the individual child because you have a score for each child.

For example -

1 ft = 12 in

3 ft =  3 ft * \frac{12 in }{1 ft}

3 ft = ( 3 * 12 )  in ⇒ 36 in

Learn more about  unit analysis

brainly.com/question/15579410

#SPJ4

3 0
2 years ago
Can someone please help me on number 3? (Number 4 too if you want to be named the brainliest)
4vir4ik [10]
3/
7/10
B.
D.
4/
7/8=0.875
-3 7/8=-3.875 is your final answer. Hope it help!
3 0
4 years ago
Read 2 more answers
Please helppp me I need it now
Aleksandr [31]

Answer:

You can either choose B or D.

8 0
3 years ago
Read 2 more answers
How many 3 number combinations are possible if you can't repeat the numbers? The numbers range from 0-39
TEA [102]

Answer: 49600

Step-by-step explanation: There are 40 ways to choose the first number

and there are 40 ways to choose the second number.

Now we take some examples to determine how many choices there are for

the third number

If the second number is 23, then the 3rd number cannot be any of these

9 numbers 19,20,21,22,23,24,25,26,or 27, since they are not at least 5

numbers away from 23.  Same for all other 40 second numbers.

Let's look at a second example which includes some on both sides of 0.

If second number is 2, we couldn't choose any of the 9 numbers 38,39,0,1,2,3,4,5,6.

So thats 40-9 or 31 choices for the 3rd number.

Answer 40*40*31 = 49600 ways.

4 0
3 years ago
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