• A. ৪০০০
• B. ২০০০
• C. ১৬০০
• D. ৮০০

Answer: Option A

Explanation:

• A. $\left\{x\in \mathrm{ℝ}:x\ge \frac{1}{4}\right\}$
• B. $\left\{x\in \mathrm{ℝ}:x\le \frac{1}{4}\right\}$
• C. $\left\{x\in \mathrm{ℝ}:x<\frac{1}{4}\right\}$
• D. $\left\{x\in \mathrm{ℝ}:x\ge 4\right\}$

Answer: Option A

Explanation:

• A. $2+\sqrt{3}$
• B. $\frac{1}{2+\sqrt{3}}$
• C. $\frac{1}{2-\sqrt{3}}$
• D. $\frac{1}{5}$

Answer: Option C

Explanation: