Numa confeitaria as amêndoas de Páscoa são vendidas a 25 €/kg acrescido de 1,50 €, que é o custo da embalagem. Seja f a função que a cada (a), quantidade de amêndoas, em quilogramas, faz corresponder, em euros, o preço total, incluindo a embalagem. A D. Lurdes comprou amêndoas e pagou com uma nota de 20 €, tendo recebido de troco 2 €. Qual foi a quantidade de amêndoas que comprou. *

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?