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.

what graph

step-by-step explanation:

option 3 . (5x + 1) - (-10x + 6)

step-by-step explanation:

option 1 :

(4x + 3) + (-9x + 4)

or 4x+3 -9x + 4

or -5x + 7

option 2

(x - 2) - (6x - 9)

or x-2-6x + 9

or -5x + 7

option 3

(5x+ + 6)

or 5x + 1 + 10x -6

or 15x -5

option 4

-4x+2x+7-3x

-7x + 2x + 7

-5x + 7

hence only option 3 did   not satisfy the given simplify expression.

80x^8−68x^6+16^5−20x^4−4x^3+8x^2

hope i'm right lol