1 . 4x2+9y2

• A. $2xy$
• B. $6xy$
• C. $12xy$
• D. $24xy$

Answer: Option C

Explanation:

2 . 4x2+9y2

• A. 12xy
• B. 24xy
• C. 2xy
• D. 6xy

Answer: Option A

Explanation:

3 . 16x2+9y2-32x-128=0

• A. 12π
• B. 10π
• C. 14π
• D. 7π

Answer: Option A

Explanation:

4 . 4x2+9y2=36

• A. 12 π
• B. 4 π
• C. 6 π
• D. 9 π

Answer: Option C

Explanation:

5 . 16x2+9y2=144

• A. $\frac{32}{3}$
• B. $\frac{3}{32}$
• C. $\frac{2}{9}$
• D. $\frac{9}{2}$

Answer: Option D

Explanation:

6 . x2+9y2

• A. 74
• B. 56
• C. 37
• D. 26

Answer: Option C

Explanation: