PLEASE HELP !!

i’ll mark brainliest if you’re correct

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

Carla is saving money for a trip this summer. she already has some money in her savings account and will add the same amount to her account each week. at the end of 2? weeks, carla has? $130. at the end of 8? weeks, she has? $280. write a linear function in the form y=mx+b to represent the amount of money m that carla has saved after w weeks.

If f(x)=x/2-3 and g(x)=4x^2+x-4, find (f+g)(x)