The median is 12.
The arithmetic mean is 12.7
The geometric mean is 11.3
Answer:
-7, -4
Step-by-step explanation:
The squares are marked by units of 2. It looks like you did not take that into account when you entered your y coordinate.

Start by dividing both sides by 3. Then take the square root of both sides. Then subtract 3 from both sides and divide by 2.
Let θ = m∡I
tan θ = 20/21
tan⁻¹ (20/21) = θ
θ ≈ 43.60° or if you need to round to another decimal point, plug the equation I put in bold into a calculator.