For 1970 through 1990, the amount A (in millions of dollars), spent on automotive advertising in the United
States can be modeled by A=0.52(t) ? + 90 where
t=0 represents 1970.
In what year was
approximately $471 million spent on automotive
advertising?A
A:1986
B:1984
C:1980
D:1982

step-by-step explanation:

idk the answer i want to say 10 but then it would be equal so try 9 but then yeah so yeah we love edgen

step-by-step explanation:

; fx

this is a direct variation proportion. y = kx

y is the total amount due, k is the constant of variation, and x is the number of texts sent.

plug in the 3.20 and the 16 to solve for the "k". this is the constant of proportionality. it is the value that will not change.

3.20 = k(16). solving you get $.20 per text.

the equation would then be y = .20x

y-y1=m(x-x1)

y-1=1(x-8)