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siniylev [52]
3 years ago
9

What is the approximate area of the circle shown below? 70 in diameter

Mathematics
1 answer:
Maksim231197 [3]3 years ago
7 0

Answer:

c

Step-by-step explanation:

area is radius squared times pi(3.14) the radius is half of the diameter  they give you the diameter so divide it by 2 to get the radius then multipy that by pi(3.14)

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Answer:

\huge\boxed{x=8;\ y=1\to(8;\ 1)}

Step-by-step explanation:

\left\{\begin{array}{ccc}y=x-7&(1)\\5+2y=7&(2)\end{array}\right\\\\\text{Substitute (1) to (2) and solve for x:}\\\\5+2(x-7)=7\qquad\text{use the distributive property}\\\\5+(2)(x)+(2)(-7)=7\\\\5+2x-14=7\\\\2x+(5-14)=7\\\\2x-9=7\qquad\text{add 9 to both sides}\\\\2x-9+9=7+9\\\\2x=16\qquad\text{divide both sides by 2}\\\\\dfrac{2x}{2}=\dfrac{16}{2}\\\\\boxed{x=8}

\text{Substitute it to (1):}\\\\y=8-7\\\\\boxed{y=1}

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