Tree pruning company a charges a one time $100 fee and $50 for each tree that they prune. tree pruning company b charges a one time $80 fee and $60 for each tree that they prune.

let the variable t represent the amount trees pruned and c represent the cost. for how many pruned trees will the cost be the same for both companies?

which system of equations can be used to solve this problem?

{c=100−50t c=80−60t

{c=50+100t c=60+80t

{c=150t c=140t

{c=100+50t c=80+60t

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?