Answer:
21
Step-by-step explanation:
21-12=9
One solution because when you switch the - to the other side it will be positive which will equal one and make it one solution.
Answer:
32
Step-by-step explanation:
it multiplies by -2 every time
1. First you need to understand that 36 seconds is 1/100 of a mile.
2. An elephant can run 0.25 miles (1/4 of a mile) in 1/100 of a hour.
3. To even this out, multiply 0.25 by 100 to find how many miles per hour an elephant can run (25 miles per hour!)