A notebook costs £1.30, a pen costs 38p , a pencil costs 21p and a sharpener costs 84p. Remi buys 2 pencils, 3 pens, 2 sharpeners and some notebooks.
He pays with £10 and receives 26p change.
How many notebooks did he buy?

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?