📝 Graphing Other Kinds Of Functions

Q1. For the function \(f(x)=3x^2-12x+7\), on which interval is the function increasing?

💡 Difficulty: easy | ✅ Correct: C

Q2. A particle moves along a line with position \(s(t)=t^3-6t^2+9t\). During which time interval is its velocity decreasing?

💡 Difficulty: medium | ✅ Correct: B

Q3. A manufacturer’s cost function is \(C(q)=0.5q^{2}+20q+500\). What is the marginal cost when \(q=30\)?

💡 Difficulty: hard | ✅ Correct: D