2 years ago

What is an expression equivalent to 7(c-4)

Mathematics

1 answer:

Lemur [1.5K]2 years ago

7 0

Answer:

7c - 28

Step-by-step explanation:

7(c - 4)

(7 × c) + (7 × - 4)

7c + (7 × - 4)

7c + -28

7c - 28

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In a circle, area and circumference can be found using the formulas A=(pi)r^2 and C=2(pi)r, respectively, Write a formula for A

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Answer:

$A = \dfrac{C^2}{4\pi}$

Step-by-step explanation:

Given that

Area of a circle $A=\pi r^2$

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$A=\pi r^2$

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Multiplying and dividing with 2:

$A = \dfrac{2\pi r}{2} \times r\\\text{Putting }2\pi r = C:\\\Rightarrow A = \dfrac{C}{2} \times r\\\text{Multiplying and dividing by } 2\pi:\\\Rightarrow A = \dfrac{C}{2} \times \dfrac{2\pi r}{2\pi}\\\text{Putting }2\pi r = C:\\\Rightarrow A = \dfrac{C \times C}{4 \pi}\\\Rightarrow A = \dfrac{C^2}{4 \pi}$