Answer:

Step-by-step explanation:
so when you multiply two numbers with the same constant, and different exponents, just add the exponents!
so it is 5 - 3 = 2
so its 
Answer:
30 seconds
Step-by-step explanation:
Find the total distance needed to be traveled. 520-250 = 270
Find combined rate. 4+5=9
Divide distance needed to be traveled by combine rate to get answer.
270/9 = 30.
Yes -4 is a interference number
CD = AD - (AB + BC)
CD = 51 - (19+14)
CD = 51 - 33
CD = 18
answer
CD = 18 mm
The first one might be b or c