Answer:
-75
Step-by-step explanation:
I just checked on a calculator
1.5 hours is in 90 minutes
You can see the answer and solution from the picture
15 since its in the middle of 10 and 20
-50 - (-221) = 171
This is because subtracting a negative number is like adding a positive version of that instead. For a more simple example:
5 - (-2) = 7 or 5 + 2 = 7