Astronomers have noticed that the number of visible sunspots varies from a minimum of about 10 to a maximum of about 110 per year. further, this variation is sinusoidal, repeating over an 11 year period,
if the last maximum occurred in 2003, write a cosine function which models this phenomenon in terms
of the time t which represents the year.

a)(x-2)^2+(y-1)^2=9

step-by-step explanation:

(picture explains)

step-by-step explanation:

answer: a

step-by-step explanation: the answer is a due to the rule of symmetry; that a line of symmetry must divide a figure into 2 pieces that are the exact same, only reflected over a line of symmetry. b and c do not have lines of symmetry and would not divide the figure evenly, thus making the answer a.