In binary, '101' + '110' = '1011'.

'12' in base-3 is 3 and '21' is 7. Their sum is 10, which is '100' in base-3.

First convert to decimal: 1010 = 10 and 1101 = 13. The sum is 10 + 13 = 23.

The sum of the roots is given by -b/a = 3/2.

The sum of the roots of a quadratic equation ax^2 + bx + c = 0 is given by -b/a. Here, it is -(-4)/2 = 2.

The sum of the roots is given by -b/a = 8/2 = 4.

The article emphasizes the importance of transitioning to renewable energy for sustainable development, making this the main summary.

The article outlines various health benefits and environmental advantages of adopting a plant-based diet, summarizing its positive impact.

Surface area = 6 * (side)² = 6 * (5)² = 6 * 25 = 150 cm².

A silent partner is one who has limited liability and does not engage in daily operations.

A general partner has unlimited liability, meaning they are personally responsible for the debts of the partnership.

A 'Wildcard' is a player who is not part of the main competition but is allowed to participate in a side event, often based on special criteria.

A polygon that has all sides and angles equal is called a regular polygon.

A concave polygon is defined as a polygon that has at least one interior angle greater than 180 degrees.

A polygon with all sides and angles equal is known as a regular polygon.

The tone is serious as the author addresses the critical issue of economic inequality with gravity.

The passage adopts an enthusiastic tone, highlighting the numerous benefits of meditation.

The passage critically examines the negative effects of social media on genuine communication.

The tone of the passage is urgent and alarming, reflecting the seriousness of the climate change issue and the need for immediate action.

The tone is urgent, as the author stresses the need for immediate and decisive action from governments to combat climate change.

The author presents a cautiously optimistic view, acknowledging both the benefits and potential drawbacks of technological advancements.

The tone of the passage is cautious but hopeful, acknowledging challenges while emphasizing potential solutions.

The author maintains an optimistic tone, focusing on potential solutions and positive outcomes.

The author expresses a hopeful outlook on the advancements and potential of artificial intelligence, indicating optimism.

The author maintains an optimistic tone, suggesting that with collective effort, positive change is achievable in climate action.

The tone reflects a sense of urgency and concern, indicating a despairing outlook on the future of climate change, thus option 2 is correct.

The tone is pessimistic, reflecting concerns about the lack of effective action and the potential consequences of inaction.

The passage conveys an optimistic view about the potential for educational reform, making option B the correct choice.

The tone of the passage is optimistic, highlighting the potential of renewable energy sources to combat climate change and promote sustainability.

The author expresses an optimistic view about the potential of technology to improve lives.