7+= Two brothers are painting pictures. One of the
brothers paints 7 pictures in a day. The other
brother paints 8 pictures but it takes him x days
to do so. Together they painted 13 pictures in
x days. The expression above models this
problem. What does represent?
A) The number of days it takes the brothers to
paint 13 pictures
B) The rate at which the two brothers work
together
C) The rate at which the second brother paints
D) The number of days it takes the first brother
to paint 13 pictures