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olga nikolaevna [1]
3 years ago
9

Twice a number plus 4 is 8

Mathematics
2 answers:
s2008m [1.1K]3 years ago
8 0

<em>Let's take the number as 'x' </em>

Twice : 2x

Plus 4 : 2x + 4

This is equal to 8.

... 2x + 4 = 8

Subtracting 4 on both sides :

... 2x = 4

Dividing by 2 on both sides :

... x = 4 / 2

... x = 2


<u><em>Hence, the number is 2. </em></u>

Hope this helps!

Sunny_sXe [5.5K]3 years ago
5 0
To do this, we must allow this hidden number to be x.
2x + 4 = 8
Now we will solve by first subtracting 4 from each side:
2x = 4
Now we will divide each side by 2 to isolate the variable:
x = 2
Therefore, the mystery number is 2.
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Find the volume of the figure.
Readme [11.4K]

Answer:

144cm^3

Step-by-step explanation:

A=1/2bh = 1/2 (6)(8)

=24

v=A×H=(24)(6)

=144cm^3

6 0
3 years ago
Read 2 more answers
I Need Help PLease!
RUDIKE [14]

Answer:

\sqrt {72} = 6\sqrt 2

Step-by-step explanation:

Ashton estimates the square root of 72 in the following way:

√72=

2√36=

2×6=12

a) Explain why his reasoning is incorrect

This is incorrect because \sqrt2 * 6 is the correct answer but he has missed the square root term on 2.

=\sqrt {2^2X2X3^2 }

=\sqrt {2^2} \sqrt 2 \sqrt {3^2 }

=2 X \sqrt 2 X 3

= \sqrt 2 X 6

or can be written as:

= 6\sqrt 2

b) Estimate the square root of 72 to the nearest tenth without using your calculator. Show your work.

Find the factors of 72 we get \sqrt {2X2X2X3X3 }  

Now, we will combine 2 terms if the are same so,

=\sqrt {2^2X2X3^2 }

=\sqrt {2^2} \sqrt 2 \sqrt {3^2 }

=2 X \sqrt 2 X 3

= \sqrt 2 X 6

= 6\sqrt 2

\sqrt {72} = 6\sqrt 2

4 0
3 years ago
HELP PLEASE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Westkost [7]

Answer:

f(0) =4

f(6) =8

Step-by-step explanation:

f(0) = ?

We know 0 is less than 5 so we use  the first part of the step function

f(0) = 0+4

      = 4


f(6) = ?

 6 is between 5 and 7 so we use the second part of the step function

f(6) =8

8 0
3 years ago
Find the center and radius for the circles with the following equation x^2+y^2-4x+6y+11=0
Vera_Pavlovna [14]
Rearrange x²+y²-4x+6y=-11 I'll tell you an easy way. take the coefficient of x and divide it by -2 and the coefficient of y and divide it by -2  so -4 ÷-2 = 2           6÷-2= -3 (2,-3) is the center of the circle to know the radius √2² + -3² + -11  =√2  The Radius equals √2
7 0
4 years ago
Rounded to three decimal places, the value of the irrational number e is .A.3.142B.3.615C.2.718D.2.947
notka56 [123]

REQUIRED:

Round to 3 decimal placed the value of the irrational number e.

Step-by-step solution/explanation;

The letter e in mathematics is also known as the Eular's number and is a mathematical constant used in many calculations especially natural logarithms of numbers.

The value of the Eular's number is approximately;

e\approx2.71828182846...

It can continue till infinity, however approximations of this number is always used to avoid unnecessary complications.

Therefore, rounded to 3 decimal places, the value of e is now;

ANSWER:

e\approx2.718

Note that we take 3 digits aftre the decimal and then if the fourth digit after the decimal is 5 or greater than 5, we make it 1 and add that 1 to the third digit after the decimal. Otherwise we simply make it zero and cancel it along with all other digits after it.

The digit that follows 8 (third digit) is less than 5, therefore, we write it off along with all other digits after it, and we are left with the decimal point and then ...718.

Option C is the correct answer.

8 0
1 year ago
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