Solve for x: 2/5=4/x

Answers

Answer 1
The answer is 10


Explanation: First you cross-multiply to get 2x=20 and then divide by 2 to get x=10
Answer 2

9514 1404 393

Answer:

  x = 10

Step-by-step explanation:

Using your number sense, you recognize that a fraction equivalent to 2/5 that has 4 in the numerator is 4/10. This tells you x = 10.

__

The usual instructions for solving this algebraically are to "cross multiply", then divide by the coefficient of x.

  2/5 = 4/x . . . . given

  2x = 20 . . . . . multiply by 5x on both sides

  x = 10 . . . . . . . divide by 2

__

You can do the above two steps both at once: multiply by 5/2x.

  (2/5)(5/2x) = (4/x)(5/2x)

  x = 20/2 = 10


Related Questions

What is the solution to the system of equations?
y = 3x - 8
y = 4 - X

Answers

Answer: x=3 , y=1

Step-by-step explanation:i good at that kind of thing

Emily sold lemonade. Each serving of lemonade was 8 fluid ounces. Which measurement is equivalent to each serving of lemonade Emily sold?

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Answer:

Catch Me Knuckles!

Step-by-step explanation:

do you like robIox because I do!! i make video and animation on ROBOX

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Answer:

Whats your username I might check you out later.

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Beth is selling tickets for a dinner at her school.
* Adult's tickets cost $6.00 each
Children's tickets cost $4.50 each
* Beth sold a total of 520 tickets
* Beth's ticket sales totaled $2,707.50.
How many tickets of each type were sold?
A. 245 children's tickets, 275 adult's tickets
B. 257 children's tickets, 263 adult's tickets
C. 260 children's tickets, 260 adult's tickets
D. 275 children's tickets, 245 adult's tickets

Answers

Answer:

D

Step-by-step explanation:

check each child answer and multiply by 4.50

check each adult answer and multiply by 6.00

add both answers up

and see which one it is

its not A, B, or C

Answer:

D

Step-by-step explanation:

x-number of children's tickets sold

y-number of adult's tickets sold

x+y=520=>x=520-y

4.5x+6y=2 707.5

45x+60y=27 075

45(520-y)+60y=27 705

15y+23 400=27 705

15y=3 675

y=245=>x=520-y=520-245=275

The cost of a new television is $948. If the value of the television decreases by 4.5% every year, which function models the value of this new television x years after it was purchased?

Answers

Answer:

t(x) = 948(0.955)^x

Answer:A

Step-by-step explanation:

7/9 = -1/2 (x +1/3)

What is the value of x?

Answers

Answer: x = - 17/9

Step-by-step explanation:

I need to write an equation for the triangle and solve for x

Answers

You know that the sum of angles of line CX has to be 180 degrees. Therefore, because you know angle EDX equals 134 degrees, and 180-134= 46, you know that angle CDE equals 46 degrees. Because you know the 3 interior angles of a triangle equals 180 degrees, if you subtract 180 - 46 - 105 = 2x-13. This simplified is 29= 2x-13. Further simplified, 42=2x. Therefore x=21 degrees.

Mariah bought 5 shirts that each cost the same amount and a pair of jeans that cost $30. She spent a total of $150 at the store. Write an equation to determine the cost of each shirt.

Answers

Answer:

150-30=5x

Step-by-step explanation:

If the total is $150 and a pair of jeans is $30, then you'd subtract them. Since you have to find out how much each shirt is, you'd put 5x on the other side of the equal sign. Then solve for X.

Hope this helps!

please help due asap

Answers

Answer:5
Explanation:Pythagorean Theorem

The graph of p = 400 and the graph of p = 50s - 200 intersect at the point (12,400). If the equation p = 50s - 200 represents the profit, p, based on s sales, what does the intersection best represent? Show work.

Answers

Answer:

This shows that the profit for 12 sales is 400

Step-by-step explanation:

If both graphs intersects then;

p = p

400 = 50s - 200

50s = 400+200

50s = 600

s = 600/50

s = 12

Substitute s =12 into p = 50s-200

p = 50(12) - 200

p = 600-200

p = 400

Hence the intersection (s, p) is (12, 400)

This shows that the profit for 12 sales is 400

So apparently the underlined answer is correct. Can somebody explain why? I will give brainliest if I get a good explanation.

Answers

Answer:water

Step-by-step explanation:money

PLS HELP I'LL MARK BRAINLEST

Answers

Wouldn't it just be 32x

Answer:

10x+12=132(exterior angle)

10x=132-12

10x=120

x=120/10=12

it be much appreciated if anyone could help out
Factor: 16w3 – u4w3

Answers

Answer:

w^3(4 + u^2)(2 + u)(2 - u)

Step-by-step explanation:

6w^3 – u^4w^3

w^3(16 – u^4)

w^3(42 - ((u^2)^2)

w^3(4 + u^2)(4 - u^2)

w^3(4 + u^2)(22 - u^2)

w^3(4 + u^2)(2 + u)(2 - u)

The circumference is 25 pi What is the diameter?​

Answers

Answer:

d=25

Step-by-step explanation:

d=C/Pi

d=25pi/pi

d=25

Answer:

Diameter = 25

Step-by-step explanation:

The circumference of a circle is 25 pi

Circumference of a circle is given by,

C = 2πr

25π = 2πr

Dividing both sides by 2π

[tex]\frac{25\pi}{2\pi}=\frac{2\pi r}{2\pi}\\\\12.5 = r\\[/tex]

Diameter = 2r

Diameter = 2(12.5)

Diameter = 25

Choose the two rectangular prisms that have a volume of 36 cm

Answers

The height=2cm, Length=6m,Width=3cm

Item 2
Identify the initial amount $a$ and the rate of growth $r$ (as a percent) of the exponential function $y=25\left(1.2\right)^t$ . Evaluate the function when $t=5$ . Round your answer to the nearest tenth.
a=
r= %
when t=5, y=

Answers

Answer:

a = 25

r = 20%

y (5)= 62.2

here you go pro

Find the ratio. Than find and interpret the value of the ratio

Answers

Answer:

The ratio is 3/4: 2

The value of the ratio is 3/8

The amount of club soda is 3/8 times the amount of white grape juice

The ratio of Club soda and White grape juice is 4:2.

The value of the ratio is 2:1.

The amount of club soda is half times the amount of white grape juice.

What is a ratio?

The ratio shows how many times one value is contained in another value.

Example:

There are 3 apples and 2 oranges in a basket.

The ratio of apples to oranges is 3:2 or 3/2.

We have,

Club soda = 4 cups

White grape juice = 2 cups

The ratio of Club soda and White grape juice.

= 4:2

The value of the ratio.

= 2:1

The amount of club soda is half times the amount of white grape juice.

Thus,

The ratio is 4:2.

The value of the ratio is 2:1.

The amount of club soda is half times the amount of white grape juice.

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What is the measure of the angle in red?

Answers

Answer:

B

Step-by-step explanation:

The red line is almost 360 degrees.

If you subtract 65 from 360 you get 295

When two straight lines or rays intersect at a shared endpoint, an angle is generated. The measure of the angle in red is 295°. The correct option is B.

What is an angle?

When two straight lines or rays intersect at a shared endpoint, an angle is generated. An angle's vertex is the common point of contact. Angle is derived from the Latin word angulus, which means "corner."

The total angle at a point is always equal to 360°. Given that the measure of the green angle is 65°.

But as it can be seen that the red angle and the green angle together form a complete rotation of 360°. Therefore, the sum of the two angles can be written as,

Red angle + Green angle = 360°

Red angle + 65° = 360°

Red angle = 360° - 65°

Red angle = 295°

Hence, the measure of the angle in red is 295°.

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An artists creates a scale model of a sculpture with a scale of 2 inches = 5 feet. if the scale moderl of the sculpture measures 8 inches tall, how many feet tall is the actual sculpture?

Answers

Answer:

The actual sculpture is 20 feet.

-

Step-by-step explanation:

[tex] \frac{2 \: inches}{5 \: feet} = \frac{8 \: inches}{x} \\ \\ \frac{40}{2} = \frac{2x}{2} \\ \\ x = 20[/tex]

Select Proportional or Not Proportional to correctly classify each pair of ratios.


Proportional Not Proportional

Answers

Answer:

Proportional

Step-by-step explanation:

Let's test this out. So for example you have the fractions: 12/30 and 18/?

Let's solve for ?

12 - 18

30 - ?

Solve: 30×18÷12=45

In the problem it also said 45 on the bottom, so yah they are proportional.

Kyla spends 60 minutes of each day exercising. Let be the number of days that Kyla exercises, and let represent the total minutes of exercise in a given time frame. Show the relationship between the number of days that Kyla exercises and the total minutes that she exercises.
What is the independent variable?

Answers

Answer:

t=60d    d is the independent variable

Step-by-step explanation:

Answer

The independent variable is the number of days that Kyla exercises.

Step-by-step explanation:

If you were dividing X6 + 4x3 + 2, how many O's would you
need when setting up the top row of your synthetic
division?

Answers

Answer:

how many O's u would use would be 4

Step-by-step explanation:

Please help (geometry) number 11

Answers

Answer:

In the image below

Step-by-step explanation:

ADC=ABC by SAS fact

ADC=ABC corresponding angles of congurrent triangle

May be ot will help.

$85 bill before tax
Discount:25%
Tax:6.4%

Answers

Answer:

$67.83

Step-by-step explanation:

Price before tax: $85

Discount: 25%

100% - 25% = 75% = 0.75

Price after discount: 0.75 * $85 = $63.75

Tax: 6.4%

100% + 6.4% = 106.4% = 1.064

Price after discount & tax: 1.064 * $63.75 = $67.83

Answer: $67.83

If 5 pizzas cost $60, how much will 9 pizzas cost?
10

Answers

Answer:

108

Step-by-step explanation:

do 60 divided by 5 and you get 12 so that = 1 pizza then do

12 x 9 to get 108

Answer:

108

Step-by-step explanation:

60 / 5

1 pizza would cost 12

9 × 12 is 108

What is the solution of this equation -4z+7=2y-3

Answers

Answer:

Form 1 question???????

What kind of slope is this?
-5,0

Answers

it is a Negative slope

Suppose y varies directly with x when x is 4, y is 32. What is y when x is -2

Answers

Step-by-step explanation:

Since y varies directly with x,

y = kx, where k is a real constant.

When x = 4, y = 32.

=> (32) = (4)k, k = 8.

Therefore when x = -2,

y = kx = (8)(-2) = -16.

what is u=b+a-k solve for a

Answers

Answer:

a= u -b + k

Step-by-step explanation:

If sin⁡ θ>0 and tan⁡ θ<0, in which quadrant does the terminal side of θ lie?

Answers

Answer:

Quadrant IV

Step-by-step explanation:

For an angle in the fourth quadrant the point P has positive x coordinate and negative y coordinate. Therefore: In Quadrant IV, cos(θ) > 0, sin(θ) < 0 and tan(θ) < 0 (Cosine positive). The quadrants in which cosine, sine and tangent are positive are often remembered using a favorite mnemonic.

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