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OverLord2011 [107]
3 years ago
7

Using the cross multiplication method, which of the following is the solution to 21/(x+4) = 7/(x+2)?

Mathematics
2 answers:
Alja [10]3 years ago
8 0

Answer:

3/(x+2)= x+1

Step-by-step explanation:

21/7=3

x/x= x

4/2=2

Makovka662 [10]3 years ago
5 0

Answer:

Step-by-step explanation:

Hello !

Using the cross multiplication method, which of the following is the solution to 21/(x+4) = 7/(x+2)?

21(x + 2) = 7(x + 4)

21x + 42 = 7x + 28

21x - 7x = 28 - 42

14x = -14

x = -14/14

x = -1

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Step-by-step explanation:

D,C,B

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3 years ago
What can I do to get my experimental probability closer to the theoretical probability?
Degger [83]

Answer:

The more trials you carry out

Step-by-step explanation:

(for example, the more times you toss the coin), the closer the experimental probability is likely to be to the theoretical probability.

8 0
2 years ago
Using the exponential growth function for the U. S. population from 1970 through 2003:
jeka94

Answer:

Step-by-step explanation:

Using the exponential growth function for the U. S. population from 1970 through 2003:

A = 205.1e^0.011t

with the U.S. population being 205.1 million in 1970, when would the U. S. population reach 350 million?

A.

2028

B.

2048

C.

2018

D.

2038

We have the expression

A = 205.1e^0.011t

We are asked to find when would the U. S. population reach 350 million

A = 350

350 = 205.1e^0.011t

We divide both sides by 205.1

Divide both sides by 205.1

350/205.1 = 205.1e^0.011t/205.1

1.7064846416 = e^0.011t

We take the log of both sides

log 1.7064846416 = log e^0.011t

log 1.7064846416 = t log 0.011

t = log 1.7064846416/ log 0.011

t = 0.1185057826

7 0
3 years ago
In each table, determine if is proportional to . Explain why or why not.
lyudmila [28]
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4 0
2 years ago
What is the equation of a circle whose center at (-5, -2) and radius is 2?​
aliya0001 [1]

The equation of a circle whose centre (-5,-2) and radius 2 is x^{2}+y^{2}+10x+4y+25=0

What is equation of a circle?

A circle is a closed curve drawn from a fixed point called centre of the circle. The distance between the centre of the circle and the arc of the circle is called the radius of the circle.

The equation of a circle with centre (h, k) radius r is

(x-h)^{2} +(y-k)^{2}=r^{2}

Given center = (-5,-2)  and Radius = 2

Put the Given value in the equation:

= (x-(-5))^{2} +(y-(-2))^{2} = 2^{2}

= (x+5)^{2} +(y+2)^{2}=2^{2}

= (x^{2} +10x+25)+(y^{2}+4y+4)= 4

= x^{2} +y^{2}+10x+ 4y+ 29 = 4

= x^{2} +y^{2}+10x +4y+ 29-4=0

= x^{2} +y^{2}+10x+4y+25=0

So, the equation of the circle whose centre is (-5,-2) and Radius 2 is

x^{2}+y^{2}+10x+4y+25=0

To read more about the equation of a circle. you can follow:

brainly.com/question/351704

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6 0
1 year ago
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