A.
4
7
=
9
T
B.
4
7
=
T
9
C.
7
9
=
T
4
D.
T
4
=
7
9
Incorrect: This proportion uses unit rate to determine how long it would take to dig 9 holes if it took 7 hours to dig 4 holes.
Correct: This proportion uses unit rate to determine how long it would take to dig 9 holes.
Incorrect: This proportion uses scale factor to figure out how long it would take to dig 7 holes if 9 holes took 4 hours.
Incorrect: This proportion uses scale factor to figure out how long it would take to dig 7 holes if 9 holes took 4 hours.