Which expression is equivalent to 3x(bx+10−(x2−5x+c) A
(3b−1)x2−5x+10+c

B
−x2+(3b+35)x−c

C
−3bx2+25x+c

D
(3b−1)x2+35x−c

David and alton are training for a race. they spend 35 minutes stretching and then go on a 5 mile practice run. david runs at a pace of 7 min/mile. alton runs at a pace of 8 min/mile. write an equation for each runner that shows the total length of their workout. then solve each equation showing your work