• B. 1
• C. 225
• D. $\frac{1}{225}$

Answer: Option C

Explanation:

• A. 10
• B. 100
• C. 150
• D. 200

Answer: Option B

Explanation:

• B. 1
• C. $\sqrt{2}$
• D. i

Answer: Option B

Explanation:

• A. 1
• B. $\frac{1}{2}$
• D. 2

Answer: Option C

Explanation:

• A. 1
• B. x
• C. (1-x)
• D. (1+x)

Answer: Option D

Explanation:

• A. $1$
• B. $x$
• C. $\left(1-x\right)$
• D. $\left(1+x\right)$

Answer: Option D

Explanation:

• A. 9
• B. 441
• C. 1
• D. 21

Answer: Option B

Explanation:

• A. $\sqrt{21}N$
• B. $\sqrt{19}N$
• C. $\sqrt{13}N$
• D. $\sqrt{23}N$

Answer: Option C

Explanation:

• A. $\frac{x-y}{x+y}$
• B. $\frac{{\left(x-y\right)}^2}{x+y}$
• C. x-y+2
• D. 2(x-y)

Answer: Option C

Explanation:

• A. $6:8$
• B. $8:3$
• C. $5:6$
• D. $3:8$

Answer: Option B

Explanation:

• A. $8:3$
• B. $5:6$
• C. $3:8$
• D. $6:4$

Answer: Option A

Explanation:

• A. 1
• B. 2
• C. -1
• D. 0.45

Answer: Option D

Explanation:

• A. $2^{n+1}$
• B. $2^{n-1}$
• C. $-2$
• D. $4$

Answer: Option C

Explanation:

• A. 5
• B. $x$
• C. $\frac{x}{2}$
• D. $2-x$

Answer: Option A

Explanation:

• A. $\pi$
• B. $\frac{\pi }{2}$
• C. $\frac{2\pi }{3}$
• D. $\frac{\pi }{4}$

Answer: Option D

Explanation: