Answer:

Step-by-step explanation:
According to the Product Rule for Exponents, 
a = 7
m = 9
n = 4
So,

So, the answer is
.
Hope this helps!!!
Please mark me as brainliest!!!
Time taken to ride 1 mile=7 min.
So time taken to ride 4 mile=4×7=28min.
Answer:
9+10 =21!
Step-by-step explanation:
What grade is this? Because i have never seen somethimg like this.