MCQ
Region represented by $\text{x}\geq0, \text{y}\geq0$ is:
- ✓First quadrant
- BSecond quadrant
- CThird quadrant
- DFourth quadrant
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$\mathrm{R}(x)=3 x^{2}+36 x+5 .$ The marginal revenue, when $x=15$ is