9. Lori owed her mother $39. Lori paid back 1/3 of this debt and then paid back 1/4 of the remaining debt.
How much does Lori still owe her mother?
- we can represent $39 just as 39
- 1/3 and 1/4 can be -1/3 and -1/4
That multiply suppose to be addition..
Lori still owes her mother $19.50.
10. A carpenter has 64m of baseboard. He installs 1/2 of the baseboard in one room. He installs another 3/5 of the original amount of baseboard in another room. How much baseboard does he have left?
64m =64
1/2 and 3/4 can be -1/2 -3/5
-1/2 x 64
= -1/2 x 64/1
=-64/2
= -32
-3/5 x 64
=-3/5 x 64/1
=-192/5
= -38.4
-32 + (-38.9) = -70.4 <---- how much was installed
64 + (-70.4) = 6.4 <----- how much he has left
The carpenter has to install 6.4m more of the baseboard.
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