Answer:
12.496
Step-by-step explanation:

I'm guessing the answer is B? I tried to isolate r and I got that result. Sorry if it's wrong!
Answer:
79
Step-by-step explanation:
So we have the function:

To find g(9), substitute 9 for t. Thus:

Square:

Subtract:

So, our answer is 79.
And we're done!
The mean absolute deviation is 4.8 I believe
Answer:
(42, 21) or (–42, –21)
Step-by-step explanation:
let A(x, y), A on line 2y = x
distance
x² + y² = 2205
(2y)² + y² = 2205
y² = 441
y = ±21
x = ±42