Answer:
9.6
Step-by-step explanation:
I think!
Let t become the time he spent commuting on the first day of his vacation.
It is then calculated as 
.
It traveled 
miles on its first day of operation.
The car traveled 
on the second day, which was 
.
So,
Total mileage= first day traveled + second day traveled 
Learn more:
Total distance traveled: brainly.ph/question/11690847
It's actually 70
28 + 28*1.5
The correct answer is
#2x^(-1/2)
Answer: -2sin³x
Step-by-step explanation:
cos ( x + y ) = cosx*cosy - sin y*sinx (1)
if x = y (1) could be express as: cos (2x) = cosx*cosx -sinx*sinx
cos 2x = cos²x -sin²x
Then sin(x)*cos2(x) − sin(x) ⇒ sinx * ( cos²x - sin²x ) - sinx
multiplying sinx*cos²x -sin³x -sinx
sinx (commom factor sinx (cos²x -sin²x -1) but 1-cos²x = sin²x
or -1 +cos²x = -sin²x ⇒sinx( -sin²x -sin²x) ⇒sinx (-2sin²x)
-2sin³x
