The recursive formula for an arithmetic sequence is f(n+1)=f(n)+4; f(0)=-2

which of the following equations are linear models for this sequence? select all that apply.

a
y=4x-2

b
y=-2x+4

c
f(n)=-2n+4

d
f(n)=4n-2

Me because some of question i don’t understand

Find the difference (8ab+a+2) - (3ab+6)

Data from 2005 for various age groups show that for each $100 increase in the median weekly income for whites, the median weekly income of blacks increases by $105. also, for workers of ages 25 to 54 the median weekly income for whites was $676 and for blacks was $527. (a) let w represent the median weekly income for whites and b the median weekly income for blacks, and write the equation of the line that gives b as a linear function of w. b = (b) when the median weekly income for whites is $760, what does the equation in (a) predict for the median weekly income for blacks?