Try: circle area, U = I × R, radius
Linear, absolute-value and exponential functions and solution boundaries.
f(x)=kx+b
f(x)=a|x−h|+k
f(x)=abˣ
x = ln c / ln b
ax+b=c ⇒ x₀=(c−b)/a
x₊ = a+b
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