Given that a, b, and c, the sides of a triangle, are such that a^2, b^2, and c^2, form an arithmetic sequence, show that cot A, cot B, and cot C also form an arithmetic sequence.

So me with this math problem. find the value of x the table shows the masses of 50 eggs. mass: 40-44 eggs: 6 mass: 45-49 eggs: x mass: 50-54 eggs: 12 mass: 55-59 eggs: 10 mass: 60-64 eggs: 7 mass: 65-69 eggs: 2 you!

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

Use the quadratic function to predict f(x) if x equals 8. f(x) = 25x2 − 28x + 585