=3(3z)2-3
=3(9z2)-3
=27z^2-3
=3(9z^2-1)
=3(3z+1)(3z-1)
Answer:
I dont speak that
Step-by-step explanation:
Step-by-step explanation:
Below is an attachment containing the solution .
Answer: An island nation with a strong navy is easier to defend.
Step-by-step explanation:
The fact that could be added to either column is that an island nation with a strong navy is easier to defend.
The information given is about facts concerning Great Britain and Japan.
Option A and D are incorrect as the information given wasn't stated. Option B is wrong because it stated a fact about South Africa.
The correct option is C.
His average speed for the first trip is 43 mph
Since Brian's average speed is x and he travels the first part for 215 miles in time t.
So, his distance d = xt
Also, the travels 75 more miles at a speed of 15 mph.
Since distance = speed time, the time he takes to cover this distance is
t' = distance/speed = 75 mi/15 mph = 5 hours
Since he covers both distances in the same time, we have that t = t' = 5 hours.
So, his average speed for the first trip x = d/t
= 215 mi/5 h
= 43 mph
His average speed for the first trip is 43 mph
Learn more about average speed here:
brainly.com/question/13605708
