Choose the missing exponent to create a polynomial? 3x^4+4x^2-9x^-? +2 1) 2 2)3 3)-9 4)7 5)4

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?

Me d is also an option but i couldn't get it in the picture

Describing the rules ot signea numbers quick check complete these sentences to describe the rules of dividing signed numbers.