Dose anyone know the answer i’m stumped ; -;

Acar travels at an average speed of 56 miles per hour. how long does it take to travel 196 miles

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

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?