KHAN ACADEMY! what is the constant of proportionality in the equation: y=2x?
constant of proportionality=??

Answer:

216

Step-by-step explanation:

I'm sure there is a simpler way to do this but this is how I did it.

First divide 18 by 6 because it triples every 6 hours.

18/6=3

This means it will triple three times

Then triple the value three times

#1. 8x3=24

#2. 24x3=72

#3. 72x3=216

In 18 hours the virus will infect 216 people.

Answer:

-5.3

Step-by-step explanation:

I'm not really sure if thats the answer but i try

Answer:

5.33333333333

Answer:

x = 12 degrees

Step-by-step explanation:

This isosceles triangle has two equal sides and thus two equal angles.  We find the measure of angle 2 by subtracting 76 degrees from 180 degrees, and then dividing the result (104 degrees) by 2:  m<2 = 52 degrees.

Then m<2 = 52 degrees = 3x + 16, or

                    52 degrees - 16 degrees = 3x, or:

                     36 degrees = 3x

Thus, x = 12 degrees

Answer:

x=-5

Step-by-step explanation

The first box has eight x's and six 1's which means that it would be written as 8x+6

The second box has four x's and fourteen -1's which means that it would be written as 4x-14

You set them equal to one another

8x+6=4x-14

You subtract 4x from both sides

4x+6=-14

Subtract 6 on both sides

4x=-20

Divide 4 on both sides

x=-5

Hope it helps :))

Answer:

Step-by-step explanation:

To solve an equation, we can only have one variable. In this case, we are given the system 2x = 5y + 14. However, we are given the value of x in terms of y. We can substitute 10y in for 2x and solve.

10y = 5y + 14

First, we need to get all the variables on one side of the equation, so we subtract 5y.

5y = 14

Divide by 5

y = 14/5 or 2 4/5 or 2.8

Now for the x part.

2x = x + 14

Subtract 1x

x = 14

Now we check our answer.

2(14) = 5(2.8) + 14

28 = 14 + 14

28 = 28

Because 28 equals 28, our solutions are correct.

Answer: d

Step-by-step explanation:

r+g less than or equal to 1,200

r less than or equal to 500

The pair of inequalities models the number of  tickets that can be sold is r + g ≤ 1200 and r ≤ 500

Let r represent the number of reserved seats and g represent the number of seats for general  admission.

Since the school has 1,200 concert tickets for sale, hence:

r + g ≤ 1200   (1)

Also, there are at most 500 reserved-seat tickets. Hence:

r ≤ 500  (2)

The pair of inequalities models the number of  tickets that can be sold is r + g ≤ 1200 and r ≤ 500

Find out more at: https://brainly.com/question/25285332

Answer:

x = 18

Step-by-step explanation:

The inner and outer triangles are similar, thus the ratios of corresponding sides are equal, that is

[tex]\frac{80}{80+2x}[/tex] = [tex]\frac{60}{60+27}[/tex] = [tex]\frac{60}{87}[/tex] ( cross- multiply )

60(80 + 2x) = 6960 ← divide both sides by 60

80 + 2x = 116 ( subtract 80 from both sides )

2x = 36 ( divide both sides by 2 )

x = 18

Step-by-step explanation:

just going tell u to use math

way

Answer:   B

Step-by-step explanation:

-4x + 2y = 6    add 4x to both sides

+4x           +4x

 2y = 4x + 6   Divide both sides by 2

 y = 2x + 3

Answer:

[tex]A = 15[/tex]   [tex]B = 20[/tex]   [tex]C = 25[/tex]

[tex]D = 30[/tex]   [tex]E = 40[/tex]   [tex]F = 50[/tex]

[tex]D = 3[/tex]    [tex]E = 4[/tex]     [tex]F = 5[/tex]

Step-by-step explanation:

Given

Similar Triangles: ABC and DEF

[tex]A = 15[/tex]

[tex]B = 20[/tex]

[tex]C = 25[/tex]

Required

Determine the sides of DEF

No options were given, so I will solve on a general terms.

Since both triangles are similar, then the following relationship exists.

DEF = ABC * n

i.e.

[tex]D = A * n[/tex]    [tex]E = B * n[/tex]     [tex]F = C * n[/tex]

Where

[tex]n = Scale\ Factor[/tex]

Assume n = 2.

So, we have:

[tex]D = A * n[/tex]    

[tex]D =15 *2[/tex]

[tex]D = 30[/tex]

[tex]E = B * n[/tex]    

[tex]E = 20 * 2[/tex]

[tex]E = 40[/tex]

[tex]F = C * n[/tex]

[tex]F = 25 * 2[/tex]

[tex]F = 50[/tex]

Assume [tex]n = \frac{1}{5}.[/tex]

So, we have:

[tex]D = A * n[/tex]    

[tex]D =15 *\frac{1}{5}[/tex]

[tex]D = 3[/tex]

[tex]E = B * n[/tex]    

[tex]E = 20 * \frac{1}{5}[/tex]

[tex]E = 4[/tex]

[tex]F = C * n[/tex]

[tex]F = 25 * \frac{1}{5}[/tex]

[tex]F = 5[/tex]

So, the possible sides are:

[tex]A = 15[/tex]   [tex]B = 20[/tex]   [tex]C = 25[/tex]

[tex]D = 30[/tex]   [tex]E = 40[/tex]   [tex]F = 50[/tex]

[tex]D = 3[/tex]    [tex]E = 4[/tex]     [tex]F = 5[/tex]

Answer:

$45

Step-by-step explanation:

let's work backwards. We know that it was 20% off, or otherwise 80% of the original cost. Let's represent the original cost with x:

0.8x = 36

Now we solve for x by dividing both sides by 0.8:

x = 45

Thus, the sweater was originally $45

Answer:

i hope i helped i wasnt sure how to answer

Step-by-step explanation:

Answer:

13x-7

Step-by-step explanation:

add 10x and 3x.

13x-5-2

subtract 2 from -5

13x-7

Answer: no, because the total distance of 31 miles is respected in the table

Step-by-step explanation:

I passed the test

Answer:

3.5

Step-by-step explanation:

The constant rate of proportionality, k, is expressed as [tex]k = \frac{y}{x}[/tex], and shows that two quantities are proportional to each other. In this logic, rearranging this in terms of y gives us:

[tex]y = kx[/tex]

Thus we can determine that k is 3.5, in this case.

Answer:

1749.6

Step-by-step explanation:

Answer:

jbvfksbvfkfjbfbk

Step-by-step explanation:

ghjkeflj

Answer:

5 feet / 6 feet = 0.8333

Step-by-step explanation:

Answer:

1040

Step-by-step explanation:

(10+4)×(20+6)=14×26

Answer:

m,

Step-by-step explanation:

Answer:

Never

Step-by-step explanation:

The diagonals of a rhombus are equal. There is one right angle in a parallelogram and it is not a rectangle. An equiangular rhombus is a square.

Answer:

sometimes

Step-by-step explanation:

a rectange has 4 right angles, while a rhombus might not always have them.

The number of ways he can distribute 4 ones into 5 groups is 120 ways.

Permutation has to do with the arrangement. For instance, to distribute "r" values into "n" groups, this can be calculated as:

Hence for you to distribute 4 ones into 5 groups, we will use the formula above to have:

5P4 = 5!/(5-4)!

5P4 = 5!/1!

5P4 = 5!

5P4 =120 ways

Hence the number of ways he can distribute 4 ones into 5 groups is 120 ways.

Learn more on permutation here: https://brainly.com/question/1216161

Answer:

The correct option is C. 47.10 inches

Step-by-step explanation:

Diameter of the tire rim is given to be 15 inches

So, The radius of the tire rim will be 7.5 inches

Now, we need to find the circumference of the tire rim

And, The circumference of the tire rim is given by the formula :

Circumference = 2·π × radius

⇒ Circumference of the tire rim = 2 × 3.14 × 7.5

⇒ Circumference of the tire rim = 47.1 inches

Therefore, The correct option is C. 47.10 inches

Answer:

15 cars

Step-by-step explanation:

240-30=210

210/14=15 cars

Answer:

13 it's 13 its 13 its 13 its 13 its 13

Answer:

I can't see the whole question I can't see the top

Answer: this is hard I hate math sorry

Step-by-step explanation:

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Answer:

Option D is the correct answer...

Hope this helps u ^_^

X - 23 = 18

According to the answer

We have to add 23 to both sides

X - 23 + 23 = 18 +23

X = 41

Answer:

5.25

Step-by-step explanation:

f(x)=7x

then x=0.75

7x0.75=5.25

so f(x) or fx = 5.25