1.
Which problem-solving strategy is used in indirect proofs?
A.
working backward
B.
decision-making
C.
guess and check
D.
draw a diagram
Hint
2.
Which assumption would you make to start an indirect proof of the statement Bob took the dog for a walk
A.
Bob will take the dog for a walk.
B.
Bob did not take the dog for a walk.
C.
Bob may take the dog for a walk.
D.
Bob does not have to take the dog for a walk.
Hint
3.
State the assumption that could be used to start an indirect proof of the statement
If 2n < 6, then n < 3
.
A.
n
> 3
B.
n
= 3
C.
n
3
D.
n
< 3
Hint
4.
State the assumption that could be used to start an indirect proof of the statement
m
1 +
m
2 = 180.
A.
m
1 +
m
2 = 90
B.
m
1 and
m
2 are complementary.
C.
m
1 +
m
2
180
D.
m
1 and
m
2 are supplementary.
Hint
5.
What is another name for an indirect proof?
A.
proof by contradiction
B.
paragraph proof
C.
default proof
D.
proof by assumption
Hint