25pi
pi x 10^2 is 100pi
Divide by four = 25pi
Answer:
78.53981634²
Step-by-step explanation:
(π×r²)÷4=area of shape
r (radius) = 10
π × 10² = 314.1592653²
314.1592653² ÷ 4 = 78.539816332
Answer: b=20
Subsitute a for 20.
b=20/4-3
b=20/1
b=20
28$
y= 40 + 25x
Hope this helps!
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