Correct answer: A

The correct answer is $54$ square units.

1. Identify the solid and measurements: Choose the appropriate dimensions, base area, radius, height, or edge length.
2. Apply the volume or surface-area formula: A cube has 6 square faces: $SA=6s^2=6(3^2)=54$.
3. Check units and reasonableness: Use cubic units for volume, square units for surface area, and check that the result matches the scale of the solid.

Correct answer: B

The correct answer is $52$ square units.

1. Identify the solid and measurements: Choose the appropriate dimensions, base area, radius, height, or edge length.
2. Apply the volume or surface-area formula: Use $SA=2(lw+lh+wh)=2(6+8+12)=52$.
3. Check units and reasonableness: Use cubic units for volume, square units for surface area, and check that the result matches the scale of the solid.

Correct answer: C

The correct answer is $28\\pi$ square units.

1. Identify the solid and measurements: Choose the appropriate dimensions, base area, radius, height, or edge length.
2. Apply the volume or surface-area formula: Use $SA=2\\pi r^2+2\\pi rh=8\\pi+20\\pi=28\\pi$.
3. Check units and reasonableness: Use cubic units for volume, square units for surface area, and check that the result matches the scale of the solid.

Correct answer: D

The correct answer is Surface area.

1. Identify the solid and measurements: Choose the appropriate dimensions, base area, radius, height, or edge length.
2. Apply the volume or surface-area formula: Surface area is the sum of the areas of all exterior faces and curved surfaces.
3. Check units and reasonableness: Use cubic units for volume, square units for surface area, and check that the result matches the scale of the solid.

Correct answer: A

The correct answer is $150$ square units.

1. Identify the solid and measurements: Choose the appropriate dimensions, base area, radius, height, or edge length.
2. Apply the volume or surface-area formula: Use $SA=6(5^2)=150$ square units.
3. Check units and reasonableness: Use cubic units for volume, square units for surface area, and check that the result matches the scale of the solid.

Correct answer: B

The correct answer is $6$ square units.

1. Identify the solid and measurements: Choose the appropriate dimensions, base area, radius, height, or edge length.
2. Apply the volume or surface-area formula: The face area is $2(3)=6$ square units.
3. Check units and reasonableness: Use cubic units for volume, square units for surface area, and check that the result matches the scale of the solid.

Correct answer: C

The correct answer is $4$.

1. Identify the solid and measurements: Choose the appropriate dimensions, base area, radius, height, or edge length.
2. Apply the volume or surface-area formula: Surface area scales by $k^2=2^2=4$.
3. Check units and reasonableness: Use cubic units for volume, square units for surface area, and check that the result matches the scale of the solid.

Correct answer: D

The correct answer is $62$ square units.

1. Identify the solid and measurements: Choose the appropriate dimensions, base area, radius, height, or edge length.
2. Apply the volume or surface-area formula: Use $SA=2(5\\cdot2+5\\cdot3+2\\cdot3)=2(10+15+6)=62$.
3. Check units and reasonableness: Use cubic units for volume, square units for surface area, and check that the result matches the scale of the solid.

Correct answer: A

The correct answer is $49$ square units.

1. Identify the solid and measurements: Choose the appropriate dimensions, base area, radius, height, or edge length.
2. Apply the volume or surface-area formula: One face is a square: $7^2=49$ square units.
3. Check units and reasonableness: Use cubic units for volume, square units for surface area, and check that the result matches the scale of the solid.

Correct answer: B

The correct answer is Volume measures space inside; surface area measures outside area..

1. Identify the solid and measurements: Choose the appropriate dimensions, base area, radius, height, or edge length.
2. Apply the volume or surface-area formula: Volume uses cubic units for interior space, while surface area uses square units for the exterior.
3. Check units and reasonableness: Use cubic units for volume, square units for surface area, and check that the result matches the scale of the solid.