The vertex is at x = -12/(2*(-3)) = 2. The maximum value is f(2) = -3(2^2) + 12(2) - 5 = 7.

The vertex occurs at x = -b/(2a) = 2. f(2) = -2(2^2) + 8(2) - 5 = 9.

Mean = (4 + 8 + 6 + 5 + 3) / 5 = 26 / 5 = 5.2, rounded down to 5.

'A blessing in disguise' refers to something that seems bad at first but results in something good.

'Costs an arm and a leg' means something is very expensive.

'Once in a blue moon' means something that happens very rarely.

'Spill the beans' means to disclose confidential information or secrets.

'The ball is in your court' means it is your responsibility to take action or make a decision.

'To break the ice' means to initiate conversation in a social situation, especially among strangers.

'To burn the midnight oil' means to stay up late working or studying.

'To throw in the towel' means to give up or admit defeat.

'A blessing in disguise' refers to an apparent misfortune that results in something good.

'Costs an arm and a leg' means something is very expensive.

'Hit the nail on the head' means to describe exactly what is causing a situation or problem.

'Let the cat out of the bag' means to accidentally reveal a secret.

'Once in a blue moon' refers to something that happens very rarely.

'The ball is in your court' means it is your turn to take action or make a decision.

'To throw in the towel' means to admit defeat or give up on a task.

Supplementary angles sum to 180 degrees. Therefore, the angle is 180 - 75 = 105 degrees.

Supplementary angles sum up to 180 degrees. Therefore, the angle measures 180 - 110 = 70 degrees.

The exterior angle of a triangle is equal to the sum of the two opposite interior angles. Therefore, the exterior angle = 50 + 60 = 110 degrees.

Complementary angles sum up to 90 degrees. If one angle is 30 degrees, the other angle is 90 - 30 = 60 degrees.

The measure of each interior angle in a regular hexagon can be calculated using the formula (n-2) * 180/n, where n is the number of sides. For a hexagon, n=6, so the measure is (6-2) * 180/6 = 120 degrees.

A regular quadrilateral is a square, and each angle in a square measures 90 degrees.

Each angle in a square measures 90 degrees.

The sum of angles in a triangle is always 180 degrees. If one angle is 40 degrees and another is 60 degrees, the third angle is 180 - (40 + 60) = 80 degrees.

The sum of angles in a triangle is 180 degrees. Therefore, the third angle = 180 - (50 + 60) = 70 degrees.

The exterior angle of a triangle is equal to the sum of the two opposite interior angles. Therefore, the exterior angle = 50 + 60 = 110 degrees.

The exterior angle of a triangle is equal to the sum of the two opposite interior angles. Therefore, the exterior angle = 50 + 60 = 110 degrees.

First, arrange the data in ascending order: 10, 12, 14, 15, 18. The median is the middle value, which is 14.