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3 years ago

If you know the area of a circle, how can you find it's radius?

Mathematics

2 answers:

pickupchik [31]3 years ago

6 0

Answer:

see explanation

Step-by-step explanation:

The area (A) of a circle = πr² ← r is the radius

If A is given then to find r

πr² = A ( isolate r² by dividing both sides by π )

r² = $\frac{A}{\pi }$

Take the square root of both sides

r = $\sqrt{\frac{A}{\pi } }$

posledela3 years ago

3 0

You have the correct idea. The area A of a circle is given by A = π r2 where r is the radius of the circle and π is approximately 3.1416. Dividing both sides of this equation by π gives A/π = r2 and hence if you know A, divide it by π and then take the square root to find r.

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A line has a slope of -3 and y-intercept of 2.

Pie

AnswA line can be written in the form y = mx + b where m is the slope and b is the y intercept.

Since the slope is given as 4, the equation will be y = 4x + b

Plugging in the point (2,1) to the equation we get 1 = 4(2) + b or 1 = b + 8

Solving for b gives b = -7 so the equation will be y = 4x - 7er:

Step-by-step explanation:

5 0

3 years ago

Ralph Chase plans to sell a piece of property for $155000. He

Mrrafil [7]

Ralph chase invested $85000 at an interest of 10% and $70000 at an interest of 8%

<h3>What is an equation?</h3>

An equation is an expression that shows the relationship between two or more numbers and variables.

An independent variable is a variable that does not depends on other variable while a dependent variable is a variable that depends on other variable.

Let a represent the amount invested at interest of 10% and b represent the amount invested at 8%, hence:

a + b = 155000 (1)

Also:

0.1a + 0.08b = 14100 (2)

From both equations:

a = 85000, b = 70000

Ralph chase invested $85000 at an interest of 10% and $70000 at an interest of 8%

Find out more on equation at: brainly.com/question/2972832

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7 0

2 years ago

What’s the answer to 4x+3=15

Anastasy [175]

Answer: 4.500

Step-by-step explanation:

4x - 18 = 2 • (2x - 9)

2 = 0

2x-9 = 0

2x = 9

x = 9/2 = 4.500

3 0

3 years ago

Order of Operations- -6+(-30) divided by 5-(-2). Explain step by step

Reil [10]

Answer:

-36/7 or -5.14287

Step-by-step explanation:

so I would get rid of parentheses you do not need them

$\frac{-6+-30}{5--2}$ = $\frac{-36}{7}$ (because when two negative come before two numbers like -x-y they are being added but negative is present to the result of the sum, when one negative sign comes after a number and the other negative sign comes before a number, like x--y they are being added as well but negative is not present to the result of the sum)