A 1 ​ =−4910a, start subscript, 1, end subscript, equals, minus, 4910 a_i = a_{i - 1} + 8a i ​ =a i−1 ​ +8a, start subscript, i, end subscript, equals, a, start subscript, i, minus, 1, end subscript, plus, 8 Find the sum of the first 575575575 terms in the sequence.

Acircle has the equation (x-2)^2 +y^2 =5. what are the coordinates of the circle's center?

If sin θ=24/25 and 0 less than or equal to θ less than or equal to π/2, find the exact value of tan 2θ. answers; a) -527/336 b) -336/527 c)7/24 d) 24/7

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?