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2 years ago

The circumference of a circle is 15 centimeters what is the area of the circle in terms of pie

Mathematics

1 answer:

inn [45]2 years ago

3 0

Answer: The area of the circle= 56.25/π

Step-by-step explanation: With the circumference of the circle already given, we can work backwards to determine the value of the radius.

The circumference of a circle is calculated as

Circumference= 2πr

Since the circumference is already known, we can now express it as;

15 = 2πr

Divide both sides of the equation by 2

7.5 = πr

If we cross multiply we now have

7.5/π = r

Having calculated the radius as 7.5/π, the area can be derived as

Area d a circle = πr²

Area of a circle = π x (7.5/π)²

Area of a circle = π x (56.25/π²)

Area of a circle = 56.25/π

The area of the circle in terms of pi is given as 56.25/π

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Question 11 of 20 : Select the best answer for the question. 11. Find the value of x in the equation 2(x – 3) + 5x = 5(2x + 6).

ivolga24 [154]

To answer this question, you need to know the rules to move a number to the left or right side of the equal sign. To solve this, you need to move all the x into one side, and then move the number into another side. The calculation would look like this:

2(x – 3) + 5x = 5(2x + 6)
2x -6 +5x = 10x +30
2x+ 5x - 10x = 30 +6
-3x= 36
x= 36/-3= -12

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2 years ago

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What is the effect of multiplying both sides of an inequality by a negative number? Explain and give an example.

tester [92]

Answer: You would swap the ineqaulity

Step-by-step explanation:

Multiplying or dividing both sides by a negative number reverses the inequality. This means < changes to >, and vice versa. For example, given that 5 < 8 we can multiply both sides by 6 to obtain 30 < 48 which is still true.

5 0

2 years ago

Please help, giving brainliest too whoever answers first

ValentinkaMS [17]

Answer:

Step-by-step explanation:

6 0

2 years ago

This graph shows the solution to which inequality?

Ksenya-84 [330]

Answer:

The graph shows the solution of the inequality y > $\frac{4}{3}$ x - 2 ⇒ D

Step-by-step explanation:

In the inequality,

If the sign of inequality is ≤ or ≥, then the line that represents it must be a solid line

If the sign of inequality is < or >, then the line that represents it must be a dashed line

If the sign of inequality is > or ≥, then the shaded area must be over the line

If the sign of inequality is < or ≤, then the shaded area must be under the line

From the given graph

∵ The slope of the line = $\frac{2--6}{3--3}$ = $\frac{2+6}{3+3}$ = $\frac{8}{6}$ = $\frac{4}{3}$

∵ The y-intercept is (0, -2)

∵ The line is dashed and the shaded area is over the line

→ By using the 2nd and 3rd notes above, the line is dashed and

the sign of inequality is >

∴ The inequality is y > $\frac{4}{3}$ x - 2

∴ The graph shows the solution of the inequality y > $\frac{4}{3}$ x - 2

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2 years ago

I need the Domain: and Range:

Aleksandr [31]

Answer:

I don't know what kind of form your assignment wants it in, but the domain (span over the x axis) is -4<=x<=5, and the range is -3<=x<=5. Perhaps write it is as "-4 to 5" for domain and "-3 to 5" for range.

Step-by-step explanation:

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1 year ago