The sum of the first 100 positive integers is 5050. That is, 1+2+· · ·+99+100 = 5050. What is the sum of the first 100 positive odd integers?

(A) 5050 (B) 10 000 (C) 10 050 (D) 10 100 (E) 10 150

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.