Could you help me with number 2 plz it a quiz

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

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?