A ruler costs x pence. a pen costs 10 pence more than a ruler.
write an expression, in terms of x, for the cost of a pen.

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

Solve this problem! extra ! 3025/5.5 = a/90.75 / = fraction

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?