Circle O has a center of (-1,5) and passes through the point (2,9) write the equation in center radius form and standard form

Me with this one question, and i'll upvote the brainliest answer

3.4a=57.8 what is the the value of a

Sera sells t-shirts at the beach. she believes the price of a t-shirt and the number of t-shirts sold are related. she has been experimenting with different prices for the t-shirts. she has collected a data set with five pairs of data; each consists of the price of a t-shirt and the number of shirts sold. the independent variable, which will go on the x-axis, is . the dependent variable, which will go on the y-axis, is the