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MA_775_DIABLO [31]
3 years ago
5

A certain positive number is multiplied by 4, and then the result is subtracted from the original number. The result is 21 less

than 0. What is the number?
Mathematics
2 answers:
tatiyna3 years ago
7 0

Answer:

The answer is 7

Step-by-step explanation:

Let the positive number x

Then multiply by 4 : 4x

Subtracted by the number which is x-4x

Then we have x-4x=-21

: -3x=-21

X= -21/-3

X= 7

stira [4]3 years ago
4 0

Answer:

The number is 7

Step-by-step explanation:

certain positive number: x

x is multipled by 4:

4x

result of this is subtracted from the original number:

so original number minus 4x,

x - 4x

the result is 21 less than 0, this means negative 21

x - 4x = 0 - 21 = -21

do algebra:

-3x = -21

multiply both sides by -1

3x = 21

divide both sides by 3

x=7

(certain positive number: x) is equal to 7

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The value of the solid's surface area is equal to the value of the solid's volume. Find the value of x. We know the length is 9
Lerok [7]

Given:

The value of the solid's surface area is equal to the value of the solid's volume.

Length(l) = 9 units

width(b) = 4 units

Height(h) = x units

To find:

The value of x.

Solution:

Solid's surface area is

Area=2(lb+bh+hl)

Area=2(9\times 4+4\times x+x\times 9)

Area=2(36+4x+9x)

Area=2(36+13x)

Area=72+26x

Volume of solid is

Volume=l\times b\times h

Volume=9\times 4\times x

Volume=36x

Solid's surface area = Volume of solid

72+26x=36x

72=36x-26x

72=10x

Divide both sides by 10.

7.2=x

Therefore, the value of x is 7.2.

4 0
3 years ago
(sin^2(0)) I really need help with this asap
maw [93]

Answer:

Asapa

(sin2(0)

5 0
2 years ago
Answer the question and prove your answer on a separate piece of paper. 1 point
EastWind [94]

Answer:

as below

Step-by-step explanation:

it's negative 4  or   -4  is the rate of change or aka  the slope

show the teacher the graph, which is free and also online.  ( Demos )

:)  you can make that graph also is my point  

6 0
3 years ago
What is x+9=2(x_1)^2 in the form of ax^2+bx +c=0
Naddik [55]
<span>x + 9 = 2(x - 1)^2
x + 9 = 2(x^2 - 2x + 1)
x + 9 = 2x^2 - 4x + 2
</span>2x^2 - 4x + 2 - x - 9 = 0
2x^2 - 5x -7 =0
7 0
3 years ago
Which is losing the fewest?<br><br> 8<br> -2<br> 5<br> -7
PilotLPTM [1.2K]
-7 is losing the fewest as it is the smallest number, and the number that is to the left of the number line.
5 0
3 years ago
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