The ratio of students with blond hair to students with brown or
black hair is 12 If there are
212 students with brown or black
hair, how many students have
blond hair?

7.3

step-by-step explanation:

answer: c

(2, -4)

goes 7 to the

(9, 4)

easy

answer:

at time x=0 we have 1000, at time x=1 we have 2000, at time x=2 we have 4000.  

so that's an initial value of 1000 and a ratio of 2,

y = 1000 (2^x)

hope this !