640 divided by 2/5 how do I solve this

Answers

Answer 1

Answer:

Step-by-step explanation:

1600

Answer 2

Answer:

1,600

Step-by-step explanation:

When dividing with fractions, remember this rule!!!!

KEEP SWITCH FLIP

- Keep the first fraction

- Switch the sign from division to multiplication

- Flip the second fraction so it becomes its reciprocal (the numerator becomes the denominator and the denominator becomes the numerator)

Let's begin!

640 ÷ 2/5

We know that every number divided by 1 is itself, thus every numerator has an invisible 1 as its denominator. Now we can rewrite it as:

640/1  ÷ 2/5

First, keep 640/1. Then change the ÷ into a ×

640/1 × 2/5

Next, flip the 2/5 so the 5 is on top and 2 is on the bottom

640/1 × 5/2

And multiply across!

640 × 5 = 3,200

1 × 2 = 2

3,200/2 = 1,600

Your answer is 1,600!!

Hope this helps clear things up for you. Let me know if you any other questions :D


Related Questions

Find the square root of "-2.5"

Answers

Answer:

1.58113883 i

Step-by-step explanation:

√-2.5 is error

1.58113883 i

i the square root of negative one.

Any number times itself is a positive number (or zero), so you can't ever get to a negative number by squaring. Since square roots undo squaring, negative numbers can't have square roots.

Answer:

[tex]1.58\ i[/tex]

Step-by-step explanation:

Step 1:  Determine the square root of -2.5

The [tex]\sqrt{-1}[/tex] is equal to i so we can say that [tex]\sqrt{(-1)^2}[/tex] is equal to [tex]\sqrt{i^2}[/tex] which is then equal to [tex]i[/tex].  This means that we have [tex]i\sqrt{2.5}[/tex].

We can then take the square root of 2.5 which is rounded to [tex]1.58\ i[/tex]

Answer:  [tex]1.58\ i[/tex]

At a mall, random people are asked what their favorite movie genre is. The results are shown in the table below.


Comedy


40


Sports


36


Animation


25


Romance


18


Drama


32


Horror


15


Documentary


22


Adventure


22

Answers

Answer:

what is the question?

210 people were asked.

the rule f(x)=50x - 8.5 represents the amount of a drug in milligrams, f(x), which remains in te blood stream after x hours. evaluate f(1.5)

Answers

Answer:

66.5

Step-by-step explanation:

Determina si los pares de líneas son paralelos, perpendiculares o ninguno de los dos.
Selecciona la respuesta correcta para las partes identificadas con letras.
a. x - 5y = 10; y = x + 4
(select)
b.
x+y =
+ y = 8; y = -7x
(select)
c. 5x – 3y = -1; 5y = -3x + 2 ||(select)
(select)
d. y = 4x - 1; 12x – 3y = 12
e. 5y = 3x + 1; 10x + 6y = 12 | (select)

Answers

Answer:

256

Step-by-step explanation:

Find the value of (2^2)^3. Then find the value of (2^3)^2. what is true about the results? Explain why.

Answers

Answer:

(2^2)3 = 2^6

(2^3)2 = 2^6

Step-by-step explanation:

There are various exponent rules. The problems that you were assigned must follow the power of a power rule:

(x^a)^b = x^a*b

Exponents must be multiplied according to this rule. Hope this helps.

want is385 rond to ten

Answers

Answer:

390

Step-by-step explanation:

5 or more, means round up.

So 385 ( 5 or above ) - round to the nearest tenths place...

= 390

Answer:

390

Step-by-step explanation:

The number in the tenth place is 80 so you look on the right, the number is 5. If the number is 5 or above, that means you go up. SO it's 390

The marks scored by a group of students in English examination are as follows: 30,32, 33, 31, 32, 33, 34, 35, 33, 34 . Find the mode of their marks.

Answers

Answer:

33

Step-by-step explanation:

33 appears most.

(m+3)square - (m-5) square

Answers

Answer:

16m-16

Step-by-step explanation:

Im not sure that’s the correct answer

Solve for x.

(8x -23)​

Answers

Answer:

x = 12

Step-by-step explanation:

simply the following ​

Answers

Answer:

6x^6..........................

At a bookstore used hardcover books sell for $8 each and used softcover books sell for $2 each. You purchase 36 used books and spend $144. How many softcover books do you buy?

Answers

Answer:

Step-by-step explanation:

Let H be the number of harcover, and S the number of softcover books.

We know that:

H+S=36

and $8*(H) + $2*(S) = $144

Rearrange the first: H = 36 - S

Use this definition of H in the second equestion:

$8*(H) + $2*(S) = $144

$8*(36-S) + $2*(S) = $144

$288 - 8S + 2S = $144

-6S = -144

S = 24

This means H = 36 - S is:

H = 36 - 24

H = 12

"You" purchased 24 softcover and 12 hardcover books.

Check the results: 24*2 + 12*8 = 48 + 96 = $144 It

works.

Simplify the expression
-1 - 2/3 (6/7 - 3/7 n)

Answers

expression.
−11/7 +2n/7

help, i need 3x+2y=-3 in slope intercept form and ive never been taught how to do it :/

Answers

Answer: y = -1.5x - 1.5 or y = -3x/2 -3/2

Step-by-step explanation:

Basically you need to know first what slope intercept form is:

y = mx + b

b is the y intercept and m is the slope

so first you have the equation 3x + 2y = -3

you will first subtract 3x from both sides because if you do something to one side of the equal sign, you have to do it to the other side:

3x + 2y - 3x = -3 - 3x

now you have 2y = -3x -3

Then you are going to divide both sides by 2:

2y/2 = -3x/2 -3/2

That gets you to

y = -3x/2 -3/2

or in fraction form, it is

y = -1.5x - 1.5

Answer:

Step-by-step explanation:

The slope intercept form uses y=mx +b where m is the slope. To convert the equation into slope intercept form you just need to isolate y.

3x+2y=-3

subtract 3x from both sides

2y= -3x-3

divide everything by 2 to isolate y

[tex]y=-\frac{3}{2} x-\frac{3}{2}[/tex]

Which digit makes this statement true?

?0,003 rounded to the nearest ten thousand is 90,000.

Answers

Answer:

9

Step-by-step explanation:

4 or lower means the number stays the same

Solve (x – 3)2 = 49. Select the values of x.

–46

-4

10

52

Answers

Answer:

x=10

x=-4

Step-by-step explanation:

Quadratic Equation:  (x – 3)^2 = 4

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :

                    (x-3)^2-(49)=0

Step 1:

valuate :  (x-3)²   =    x²-6x+9

Factoring x²-6x-40  

The first term is, x²its coefficient is  1 .

The middle term is,  -6x  its coefficient is  -6 .

The last term, "the constant", is  -40  

Step-1 : Multiply the coefficient of the first term by the constant   1 • -40 = -40  

Step-2 : Find two factors of  -40  whose sum equals the coefficient of the middle term, which is   -6 .

     -40    +    1    =    -39  

     -20    +    2    =    -18  

     -10    +    4    =    -6    That's it

Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above,  -10  and  4

x²- 10x + 4x - 40

Step-4 : Add up the first 2 terms, pulling out like factors :

                   x • (x-10)

             Add up the last 2 terms, pulling out common factors :

                   4 • (x-10)

Step-5 : Add up the four terms of step 4 :

                   (x+4)  •  (x-10)

            Which is the desired factorization

Equation at the end of step

1

:

 (x + 4) • (x - 10)  = 0  

STEP

2 :

Theory - Roots of a product

A product of several terms equals zero.  

When a product of two or more terms equals zero, then at least one of the terms must be zero.  

We shall now solve each term = 0 separately  

In other words, we are going to solve as many equations as there are terms in the product  

Any solution of term = 0 solves product = 0 as well.

Solving a Single Variable Equation:

Solve  :    x+4 = 0  

Subtract  4  from both sides of the equation :  

                     x = -4

Solving a Single Variable Equation:

Solve  :    x-10 = 0  

Add  10  to both sides of the equation :  

                     x = 10

Supplement : Solving Quadratic Equation Directly

Solving x²-6x-40  = 0   directly  

Earlier we factored this polynomial by splitting the middle term. let us now solve the equation by Completing The Square and by using the Quadratic Formula

Parabola, Finding the Vertex:

Find the Vertex of   y =x²-6x-40

For any parabola,Ax²+Bx+C,the  x -coordinate of the vertex is given by  -B/(2A) . In our case the  x  coordinate is   3.0000  

Plugging into the parabola formula   3.0000  for  x  we can calculate the  y -coordinate :  

 y = 1.0 * 3.00 * 3.00 - 6.0 * 3.00 - 40.0

or   y = -49.000

Parabola, Graphing Vertex and X-Intercepts :

Root plot for :  y = x²-6x-40

Axis of Symmetry (dashed)  {x}={ 3.00}  

Vertex at  {x,y} = { 3.00,-49.00}  

x -Intercepts (Roots) :

Root 1 at  {x,y} = {-4.00, 0.00}  

Root 2 at  {x,y} = {10.00, 0.00}

Solve Quadratic Equation by Completing The Square

Solving   x²-6x-40 = 0 by Completing The Square .

Add  40  to both side of the equation :

  x2-6x = 40

Now the clever bit: Take the coefficient of  x , which is  6 , divide by two, giving  3 , and finally square it giving  9  

Add  9  to both sides of the equation :

 On the right hand side we have :

  40  +  9    or,  (40/1)+(9/1)  

 The common denominator of the two fractions is  1   Adding  (40/1)+(9/1)  gives  49/1  

 So adding to both sides we finally get :

  x2-6x+9 = 49

Adding  9  has completed the left hand side into a perfect square :

  x2-6x+9  =

  (x-3) • (x-3)  =

 (x-3)2

Things which are equal to the same thing are also equal to one another. Since

  x2-6x+9 = 49 and

  x2-6x+9 = (x-3)2

then, according to the law of transitivity,

  (x-3)2 = 49

We'll refer to this Equation as  Eq. #3.2.1  

The Square Root Principle says that When two things are equal, their square roots are equal.

Note that the square root of

  (x-3)2   is

  (x-3)2/2 =

 (x-3)1 =

  x-3

Now, applying the Square Root Principle to  Eq. #3.2.1  we get:

  x-3 = √ 49

Add  3  to both sides to obtain:

  x = 3 + √ 49

Since a square root has two values, one positive and the other negative

  x2 - 6x - 40 = 0

  has two solutions:

 x = 3 + √ 49

  or

 x = 3 - √ 49

Solve Quadratic Equation using the Quadratic Formula

3.3     Solving    x2-6x-40 = 0 by the Quadratic Formula .

According to the Quadratic Formula,  x  , the solution for   Ax2+Bx+C  = 0  , where  A, B  and  C  are numbers, often called coefficients, is given by :

                                     

           - B  ±  √ B2-4AC

 x =   ————————

                     2A

 In our case,  A   =     1

                     B   =    -6

                     C   =  -40

Accordingly,  B2  -  4AC   =

                    36 - (-160) =

                    196

Applying the quadratic formula :

              6 ± √ 196

  x  =    —————

                   2

Can  √ 196 be simplified ?

Yes!   The prime factorization of  196   is

  2•2•7•7  

To be able to remove something from under the radical, there have to be  2  instances of it (because we are taking a square i.e. second root).

√ 196   =  √ 2•2•7•7   =2•7•√ 1   =

               ±  14 • √ 1   =

               ±  14

So now we are looking at:

          x  =  ( 6 ± 14) / 2

Two real solutions:

x =(6+√196)/2=3+7= 10.000

or:

x =(6-√196)/2=3-7= -4.000

Two solutions were found :

x = 10

x= -4

please help me.... duogqfhefbjehfyugihkbjnfjkhdsg

Answers

Answer:

B. 12w + 62 = 242 is the answer  Happy to Help :)

Step-by-step explanation:

(ILL MARK BRAINLIEST) For Alexandra's lemonade recipe, 8 lemons are required to make 4 cups of lemonade.
Fill out a table of equivalent ratios and plot the points on the coordinate axes
provided.

Answers

Answer:

Check explanation

Step-by-step explanation:

2 lemons, 1 cup8 lemons, 4 cups10 lemons, 5 cups

Help please

3. A line passes through the points -6,-8 and -3,-7. What is the equation of the line in slope intercept form?

A. Y = 3x - 6

B. Y = 1/3x + 6

C. Y = 1/3x - 6

D. Y = 3x + 6

Answers

Answer:

the answer is C

Step-by-step explanation:

yeah-ya.... right?


a. What is the length of the bedroom on the scale drawing?
b.
What is the width of the bedroom on the scale drawing?

Answers

Ok so every 2m= 1cm. So you have to divide your side lengths (4 and 6) by 2m in order to find out how many centimetres. 4/2 is 2 and 6/2 is 3 so you have side lengths of 2com and 3cm.
So your lengths was 6m, now it’s 3cm.
And you width was 4m, now it is 2cm

Someone help me please

Answers

Answer: jo mama medicine

Step-by-step explanation: 1st one 2nd two!

20 students are standing in a line to buy food at football game the first three students spend 24$ on food how much do thr first three stundents spend on food per person

Answers

Answer:

The first 3 student spend $8 per person

Step-by-step explanation:

1. $24=3x (divide both sides by 3)

2. $8=x

Hopefully I understood the question correctly

Noreen can walk 1/3 of a mile in 12 minutes what is her average speed in miles per hour. (this is multiple choice)
A. 36 miles per hour
B. 12 miles per hour
C. 1/4 a mile per hour
D. 1 2/3 miles and hour
ANSWER FAST PLEEEEASE

Answers

The answer is D.
Divided 60 by 12, then multiply that by 1/3 to find your answer.

2. Solve the following equation for b. 6b + 2a - 4 = 2b + 3a
$b = a + 1
b= 5a+1/2
b= a+4/4
b= 5a+4/8

Answers

Answer :

‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎ ‎[tex]\bigstar\boxed{\bf\purple{\leadsto b=\dfrac{a+4}{4}}}[/tex]

⠀⠀━━━━━━━━━━━━━━━━━━━━━━━━━━━━⠀⠀

On solving the given equation for b :

[tex]\rm{\longrightarrow 6b+2a-4=2b+3a}[/tex]

‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎

‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎[tex]\rm{\longrightarrow 6b-2b=3a-2a+4}[/tex]

‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎

‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎[tex]\rm{\longrightarrow 4b=a+4}[/tex]

‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎

‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎[tex]\rm{\longrightarrow b=\dfrac{a+4}{4}}[/tex]

‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎‎‎ ‎ ‎

⠀⠀━━━━━━━━━━━━━━━━━━━━━━━━━━━━⠀⠀

Given that :

6b + 2a - 4 = 2b + 3a

To Find :

The value of b

Solution :

[tex]\qquad \sf \: { \dashrightarrow 6b + 2a - 4 = 2b + 3a }[/tex]

[tex]\qquad \sf \: { \dashrightarrow 6b - 2b - 4 = 3a - 2a }[/tex]

[tex]\qquad \sf \: { \dashrightarrow 4b - 4 = a }[/tex]

[tex]\qquad \sf \: { \dashrightarrow 4b = a + 4}[/tex]

[tex]\qquad \bf \: { \dashrightarrow b = \dfrac{a + 4}{4} }[/tex]

Hence option 3 is correct!

Find the slope of the line that passes through (-1, -1) and (98, 87).

Answers

Answer:    slope =  ⁸/₉  

Step-by-step explanation:      

    The question gives us two points,  (-1, -1) and (98, 87), from which we can find the slope and later the equation of the line.

Finding the Slope  

The slope of the line (m)   = (y₂ - y₁) ÷ (x₂ - x₁)  

                                            = (87 - (-1)) ÷ (98 - (-1))        

                                            =  (88) ÷ (99)    

                                            =   ⁸/₉  

Checking my answer visually:  

Finding the Equation

We can now use the point-slope form (y - y₁) = m(x - x₁)) to write the equation for this line. Once we have that equation, we can graph it to see if it passes through the two points. If it does, then we calculated the slope correctly.

                               ⇒  y - (-1) = ⁸/₉ (x - (-1)              [using the point (-1, -1)]

                                      y + 1  = ⁸/₉ (x + 1)  

 

To test my answer, I have included a Desmos Graph that I graphed using the information provided in the question and my answer.  

if a >b, then ac> bc true or false?

Answers

Answer:

False

Step-by-step explanation:

a>b

Let c> 0 then ac>bc because we are multiplying by a positive number

if c<0  then ac < bc because we are multiplying by a negative number we have to flip the inequality symbol

Since we do not know the value of c, we have to go with false

help help help help help help help​

Answers

Answer:

9.  A: 3:00 A.M.

10. C: 6.535 kg

11. D: Php 1,600.00

12. D: 217,500

13. A: P450.00

14. A: 7  

15. D: 5.48 x 10^4


Which of the following could be the number shown on the number line?
O A. 35
B. 738
C. 30
O D. 37
Pllllzzzzz help

Answers

Answer: A) √35

Step-by-step explanation:

You can notice that the point is in the interval (5 ; 6 )That is , we can write in this form:[tex]5<x<6[/tex] ; where x is our point that lies on the segment (5 ; 6 )Let 's write down 5 and 6 in this form[tex]5=\sqrt{25} \ \ ; \ \ 6=\sqrt{36 }[/tex] [tex]\sqrt{25} <x<\sqrt{36} \Longrightarrow x \ can \ be \ equal \ to \ \sqrt{35} \ and \ \sqrt{30 } \\\\ But \ since \ the \ point \ is \ closer \ to \ point \ 6, \ then \ \boxed{x=\sqrt{35} }[/tex]  

what can be multiplyed with 10.75 to make 100

Answers

Answer:

9.30232558

Step-by-step explanation:

Set up an equation to solve for it. For instance, the following:

[tex]10.75*x=100[/tex]

[tex]x=9.30232558[/tex]

Which is an equation of the line through (0,0) and (2, -3)?
A. y = 3/2x
B. y = 2/3x
C. y = - 2/3x
D. y = -3/2x

Answers

The equation of the line passing through the points (0,0) and (2, -3) is y = (-3/2)x. Option D.

To find the equation of the line passing through the points (0,0) and (2, -3), we can use the point-slope form of a linear equation: y - y1 = m(x - x1), where (x1, y1) are the coordinates of one point on the line, and m is the slope of the line.

Given the points (0,0) and (2, -3), we can calculate the slope as follows:

slope (m) = (change in y) / (change in x)

= (-3 - 0) / (2 - 0)

= -3/2

Now that we have the slope, we can substitute one of the given points and the slope into the point-slope form to find the equation of the line. Let's use the point (0,0):

y - y1 = m(x - x1)

y - 0 = (-3/2)(x - 0)

y = (-3/2)x Option D is correct.

For more such question on equation. visit :

https://brainly.com/question/22688504

#SPJ8

PLEASE HELP ME

Given the coordinates below, what is AB and what is the midpoint of AB

A (-6, -10), B (2, 5)

Answers

Answer:

A. 17

Step-by-step explanation:

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