Robbie wants to buy his friend a new phone for his birthday, robbie’s job at the mall pays about $54 and an extra $1.50 per item he sells. how many items does he need to sell to reach his goal of $455.50? * 40 points*

Cherie works in retail and her weekly salary includes commission for the amount she sells. the equation s=400+0.15c models the relation between her weekly salary, s, in dollars and the amount of her sales, c, in dollars. interpret the slope of the equation.